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The unclued Across lights, when correctly paired with the unclued Down ones, are of a kind, verifiable in Brewer.   Across 4 Deer and setters disturbed fire-arm supports (11, hyphened) 11 Bits of lava surround unfortunate one (7) 13 Valentino edited modern work (9, hyphened) 14 Wader's support (5) 19 African Moslems' bad sinuses (7) 21 Isle's black pick-up (4) 23 Young tree — one that's alright round heather (7) 24 It's almost flat panic, initially! (4) 30 Medley from a couple of little girls (7) 32 In full – on the run?

The unclued lights, individually (each of two words), or paired, are of a specific kind, verifiable in Brewer 17th Edition revised. Ignore a diacritic in the solution at 6 Down.   Across 10 Make an impression as a sculptor? (10, three words) 12 Grim death of a harvester (6) 13 Wise men deck out, when allured (8) 17 Like the Arimaspi, seductive, not hard, English at heart (7, hyphened) 18 Tune that's popular – but not in the plane!

The unclued lights can be arranged into a chain of anagrams of 3 to 11 letters in length, with the addition of one letter step by step.   Across 7 Towboat capsized in channel (3) 11 Contain grease once (6) 13 Against work — was perplexed (7) 15 Bender on river (5) 16 Two flowers of sorts in colleges (5) 17 Prudently state diocese (6) 20 Hymn to alluring female without power (6) 21 Associated feature that is in the can (5, hyphened) 27 Artificial swap of Mafia member (7, hyphened) 29 Warm-up races! (5) 30 One hug could become sufficient (6) 32 Great desire of ogre, edified (5) 34 Herbie's mallet for game (6) 36 Japanese artist's black structure (5) 37 Broadcasting with Grace — but not young Deborah (5, two words) ... 38 ...

The unclued lights, (one individually, one of two words and three pairs), are of a kind.   Across   4    Popular executive having brush with copper can’t be condoned (11) 12    Left back’s round, round body (5) 13    Artless pastor immersed in revenue probe (11) 14    It’s steady to be unsteady (4) 15    One member’s a scoundrel (3) 18    Remained firm to the finish and awfully rude (7) 19    Levantine query to god’s high priesthood (7) 23    Returning runner has cost of Malay fabrics (6) 24    1300H — united — agree?

The unclued lights (one of two words) are of a specific kind. Ignore all accents.   Across 1 H-E-X? (5) 4 Series of numbers causing confab about 1 and 101 (9) 10 In an alienating way, first disproving 4 = 4. See? (10) 11 Shaver heard to be one on the way up?

The solutions to numbered lights are the words missing from the story. The unclued lights are the names of twenty-two Scottish lochs.  However, forty-four names of lochs appear in the story, all of which are hidden or appear in jumbled form in the story. Solvers are not required to list the ‘discarded’ lochs.   I was glad to receive the 26 (hyphened) from both my surgeons who told me that no 5 had 22 following the operation on my knee which I had injured falling off a 41.   They told me, ‘Watch how far you 38 though. You can try one or two miles without any effect. Remember another strain keeps you off the road again.’ ‘So I reckon my plans for my 44 bike trip to the 23 of France have to be 25 short,’ I pensively replied.

The unclued lights (two of three and one of two words), when preceded by the same word which solvers must include along with their completed grid, can be verified in Brewer.   Across   9    Small cafe spoken of in ski-lift (4, hyphened) 11    Computer functions ’til a server crashes (10) 16    Mature writer backed Ireland first (5) 17    It’s cold, but hot when one is there!

When paired, the unclued lights (one hyphened) are of a kind. Ignore two accents. (The solution at 15D is not listed in Chambers and that at 36D only at its definition.)   Across 3    Global popularity of a lecturer in Keele, say (12) 13    Covered pathways badly made inside, unfortunately (8) 18    Race-course records medal (5) 19    Forced Alan to be involved with U-turn (9) 22    Chemical company is here in France (3) 24    Endless yearning to embrace secretary causing gloom (7) 25    Allowed fellow to enter, then departed (4) 26    Would it provide some relief and relaxation? (7) 28    Novel resort in Arden?

The unclued lights are of a kind, verifiable in an entry in Brewer. Solvers are required to highlight an eight-letter headword from this entry in the completed grid. Elsewhere, ignore all accents.

Each of the four paired lights (at 1A/4, 13/14, 30/31 and 32/33) forms a RIGHT ANGLE which is the solution in each case. Four right angles equal THREE SIXTY DEGREES (the solutions at 23/40/15), thus making the FULL CIRCLE of the title. First prize R.R.