Acrimonious about the beer? (6)
I believe the answer is:
bitter
I believe this clue is a double definition.
'acrimonious' is the first definition.
(I know that acrimonious can be written as bitter)
'the beer?' is the second definition.
(bitter is a type of beer)
'about' acts as a link.
(Other definitions for bitter that I've seen before include "Beer; not sweet" , "Act nervously" , "severe" , "Causing unhappiness" , "Hard to accept" .)