Singular stock phrase for men only (4)
I believe the answer is:
stag
'men only' is the definition.
(I've seen this before)
'singular stock phrase' is the wordplay.
'singular' becomes 's' (abbreviation sometimes used in dictionaries).
'stock phrase' becomes 'tag'.
's'+'tag'='STAG'
'for' is the link.
(Other definitions for stag that I've seen before include "one may get in a rut" , "Stockmarket operator gambling on a quick profit" , "A fully-grown male deer" , "Excluding women" , "in a rut, perhaps?" .)