Food in retreat, scrumptious (4)
I believe the answer is:
eats
'food' is the definition.
(eats can mean food)
'in retreat scrumptious' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EATS' is hidden within 'retreat scrumptious'.
(Other definitions for eats that I've seen before include "Munches" , "worries" , "Consumes with teas" , "Ingests" , "Tuck" .)