Officers' money (5)
I believe the answer is:
brass
This clue is a double definition.
'officers'' is the first definition.
(I've seen this in another clue)
'money' is the second definition.
(informal term for money)
(Other definitions for brass that I've seen before include "Alloy; money" , "Instruments, alloy" , "Baggage" , "Yellow alloy" , "cash" .)