Drink's rough, reportedly (7)
I believe the answer is:
draught
'drink's' is the definition.
(draught is a kind of drink)
'rough reportedly' is the wordplay.
'rough' becomes 'draft' (synonyms).
'reportedly' shows a homophone (sound like).
'draft' sounds like 'DRAUGHT'.
(Other definitions for draught that I've seen before include "it's felt, when short of cash" , "drink needed" , "Cool air current indoors" , "Unwelcome blow" , "Water depth; served from a cask" .)