Return of firearms for men only (4)
I believe the answer is:
stag
'men only' is the definition.
(as in a stag do)
'return of firearms' is the wordplay.
'return of' says the letters should be written backwards.
'firearms' becomes 'gats' (gat is a kind of firearm).
'gats' reversed gives 'STAG'.
'for' is the link.
(Other definitions for stag that I've seen before include "Men-only" , "in a rut, perhaps?" , "involving men" , "Male animal" , "Game - speculator" .)