Brandy man on beer, drinking very quietly (9)
I believe the answer is:
applejack
'brandy' is the definition.
(applejack is a kind of brandy)
'man on beer drinking very quietly' is the wordplay.
'man' becomes 'jack' (I've seen this before**).
'on' is a charade indicator (letters next to each other).
'beer' becomes 'ale' (I've seen this before).
'drinking' is an insertion indicator.
'very quietly' becomes 'pp'.
'ale' enclosing 'pp' is 'apple'.
'jack' after 'apple' is 'APPLEJACK'.
(Other definitions for applejack that I've seen before include "spirit" , "Something for the drinker" .)