19 Across, Eight times used in support behind commander (7) O?T?T?E
23 Across, Subject posed by sidesman? (3,6) L?Y ?I?U??
25 Across,Mythical creature:head of chap,tail of filly,sounds of hooves (7) C?C???S
27 Across, Month's work starts to secure your spy film (9) O?T???S??