Brief film about whiskey (6)
I believe the answer is:
lawyer
'brief' is the definition.
(I've seen this before)
'film about whiskey' is the wordplay.
'film' becomes 'layer' (I've seen this before).
'about' indicates putting letters inside.
'whiskey' becomes 'w' (alpha bravo charlie delta ...).
'layer' placed around 'w' is 'LAWYER'.
(Other definitions for lawyer that I've seen before include "Man at the bar?" , "Solicitor, for example" , "court worker" , "barman" , "Legal adviser" .)