CRYPTIC CROSSWORD No. 16,669

ACROSS: 1 Disunite. 5 Runway. 9 Logician. 10 Outing. 12 Data. 13 Cordon bleu. 15 Income support. 19 Lance corporal. 23 Portcullis. 25 Asti. 28 Armlet. 29 Strumpet. 30 Kismet. 31 Transact. DOWN: 1 Delude. 2 Sight. 3 Nice. 4 Tearoom. 6 U-turn. 7 Whirlpool. 8 Yoghurts. 11 Ides. 14 Acne. 15 Ignoramus. 16 Ear. 17 Park. 18 Flapjack. 20 Oslo. 21 Printer. 22 Diktat. 24 Crepe. 26 Sepia. 27 Ruin.