Month on beer for bloke (4)
I believe the answer is:
male
'bloke' is the definition.
'month on beer' is the wordplay.
'month' becomes 'M' (standard abbreviation).
'on' says to put letters next to each other.
'beer' becomes 'ale' (type of beer).
'm'+'ale'='MALE'
'for' is the link.
(Other definitions for male that I've seen before include "man?" , "Maldives capital; masculine" , "A gender" , "As are drakes, bulls etc." , "Lame sort of fellow" .)