2146: 4 ÷ 4 = 8
From our UK edition
The unclued four-letter words can be paired in a particular way to form the remaining unclued lights (one of two words). Across 5 Be in contact with a jock’s love-in (6) 10 Isolation of actors Chaney and Wallach by headland (10) 12 Scar on saint is something of a problem