Overheard a complaint about the drink (4)
I believe the answer is:
wine
'the drink' is the definition.
(wine is an alcoholic drink)
'overheard a complaint' is the wordplay.
'overheard' indicates a 'sounds like' (homophone) clue.
'a complaint' becomes 'whine' (whine is a kind of complaint).
'whine' is a homophone of 'WINE'.
'about' is the link.
(Other definitions for wine that I've seen before include "Plonk" , "Colour" , "Something made with 16?" , "Fermented grape juice" , "Vino" .)