Rotten food store works to come back (7)
I believe the answer is:
spoiled
'rotten' is the definition.
(I've seen this in another clue)
'food store works to come back' is the wordplay.
'food store' becomes 'deli' (short for delicatessen).
'works' becomes 'ops' (op is short for opus, a work).
'to come back' is a reversal indicator.
'deli'+'ops'='deliops'
'deliops' backwards is 'SPOILED'.
(Other definitions for spoiled that I've seen before include "Damaged, harmed" , "Of child, excessively pampered" , "Marred" , "Ruined" , "Rotten" .)