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1a. ??b?t. Piece of copper the length of one's arm.
1d. ??w?????????. Before battle, commander and sergeant check ranks for inappropriate demeanour?.
10a.??s?s????. Model train sets unlikely to be damaged.24a. 2words. 5.9. ????? D?r?????n.Settling into part after little time, old Irish actor will carry it out.
7d..??e?t????. Articles on special effects, say for putting on a show.

cu + bit?

PS The number of letters would help my ailing old eyes. LOL

10A. RESISTANT (anag)

COWARDLINESS

co = commander; war = battle; sargeant = DS; ranks = lines

Sorry jolan. Thanks for your help.

THE + A + TRICS (sounds like tricks = special effects)

Remaining one might be "stage direction" but haven't parsed it yet (part might be stage???)

Yep Ron! It IS; STAGE DIRECTION

t + aged IR (old Irish) in section = part

Thanks jolan could be Stagedirection.