SOLUTION TO PRIZE CROSSWORD No 15,900:

ACROSS: 6 Insurmountable. 9 Scared. 10 End-users. 11 Impaired. 13 Bemuse. 15 Trough. 17 Tendon. 19 Intern. 20 Assemble. 22 Dictator. 24 Armada. 26 Plain chocolate. DOWN: 1 Circumstantial. 2 Tsar. 3 Trader. 4 Inedible. 5 Bass. 7 Overdo. 8 Lords-and-ladies. 12 Abode. 14 Modem. 16 Genetics. 18 Hairdo. 21 Slalom. 23 Thin. 25 Meal.