CRYPTIC CROSSWORD No. 16,873

ACROSS: 6 Christmas cards. 9 Putsch. 10 Strategy. 11 Abu Dhabi. 13 Accost. 15 Nuance. 17 Medici. 19 U-boats. 20 Listener. 22 Culpable. 24 Record. 26 Characteristic.

DOWN: 1 Scrubbing brush. 2 Arms. 3 Asthma. 4 Username. 5 East. 7 Massif. 8 Digestive tract. 12 Drama. 14 Chime. 16 Cashback. 18 Fleece. 21 Sortie. 23 Pare. 25 City.