What the music director may do for old citizen soldiers? (9)
I believe the answer is:
trainband
'citizen soldiers?' is the definition.
(historical term for a group of civilian soldiers)
'what the music director may do for old' is the wordplay.
I cannot quite understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
'music' could be 'rai' (I have seen 'Algerian music' mean 'rai' so perhaps 'music' could also mean 'rai') and 'rai' is located in the answer.
'director' could be 'd' and 'd' is present in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for trainband that I've seen before include "Former militiamen" , "citizen soldiers?" , "Members of militia" .)