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I give up o these last four but will kick myself when you show me the answers please.
1ac Check on doctor for short royal officer (5) ? H A ? ?
12 ac Instrument used by orchestra's trumpeter to some extent (7)
? A S ? ? U ?
15 d Acid solution stops Indian antelope (8) S ? ? S O ? I ?
21 ac Study boxing a short time and get punched (7) ? E ? T ? S E

12 Rastrum, in the clue.
15 Sassolin
1 Chamb (Chamb/erlain).

21 Pertuse, punched. Peruse, study, with T, time.

Thanks malone !!

Glad I could help.