Money for instruments (5)
I believe the answer is:
brass
I believe this clue is a double definition.
'money' is the first definition.
(brass can informally mean money)
'instruments' is the second definition.
(I've seen this before)
'for' is the link.
(Other definitions for brass that I've seen before include "Ready" , "It's there, if muck's there" , "Alloy of copper and zinc" , "Zinc-copper alloy - cheek" , "Money - cheek!" .)