Abandon swallowing small sweet (7)
I believe the answer is:
dessert
'sweet' is the definition.
(I know that sweet can be written as dessert)
'abandon swallowing small' is the wordplay.
'abandon' becomes 'desert' (desert can mean to leave or abandon).
'swallowing' is an insertion indicator.
'small' becomes 's' (abbreviation - e.g. clothes size).
'desert' going around 's' is 'DESSERT'.
(Other definitions for dessert that I've seen before include "End of meal" , "Fool possibly" , "Spotted Dick is one" , "Sweet, last course of a meal" , "tart?" .)