Hat drunkard pinches quietly (6)
I believe the answer is:
topper
'hat' is the definition.
(I know that topper is a type of hat)
'drunkard pinches quietly' is the wordplay.
'drunkard' becomes 'toper' (I've seen this before).
'pinches' is an insertion indicator (pinch can mean to steal).
'quietly' becomes 'p' (musical symbol).
'toper' placed around 'p' is 'TOPPER'.
(Other definitions for topper that I've seen before include "good sort" , "expensive hat" , "Executioner" , "Informally a top hat or jolly good fellow" , "Hat for formal occasions" .)