Sweet abandon, say (7)
I believe the answer is:
dessert
'sweet' is the definition.
(synonyms)
'abandon say' is the wordplay.
'abandon' becomes 'desert' (desert can mean to leave or abandon).
'say' shows a homophone (sound like).
'desert' is a homophone of 'DESSERT'.
(Other definitions for dessert that I've seen before include "Sweet, afters" , "Sweet, last course of a meal" , "Fool possibly" , "End of meal" , "Charlotte maybe" .)