Decline drinks, say (5)
I believe the answer is:
lapse
'decline' is the definition.
(I've seen this before)
'drinks say' is the wordplay.
'drinks' becomes 'laps' (lapping is a kind of drinking).
'say' shows a homophone (sound like).
'laps' is a homophone of 'LAPSE'.
(Other definitions for lapse that I've seen before include "Fault" , "Revert (to bad habits, etc)" , "Slip; sounds like circuits" , "Go back to bad behaviour" , "Pleas (anag)" .)