SOLUTION TO PRIZE CROSSWORD No 15,666:

ACROSS: 6 Colorado beetle. 9 Plasma. 10 Moussaka. 11 Escalate. 13 Autumn. 15 Alarms. 17 Remain. 19 Static. 20 Rebutted. 22 Ice cream. 24 Casing. 26 Plaster of Paris. DOWN: 1 Ecclesiastical. 2 Plus. 3 Errata. 4 Obdurate. 5 Fees. 7 Dimmer. 8 Like-mindedness. 12 Adapt. 14 Toast. 16 Mackerel. 18 Crambo. 21 Biceps. 23 Cast. 25 Spry.