Sam, who belted any number of army officers! (6)
I believe the answer is:
browne
'of army officers' is the definition.
The definition suggests a singular noun which matches the answer.
'sam who belted any number' is the wordplay.
I cannot really understand how this works, but
'number' could be 'e' (e is a kind of number) and 'e' is present in the answer.
The remaining letters 'brown' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for browne that I've seen before include "Sam ---, military belt" , "Physician and author" .)