Deal in an abandoned food shop (4)
I believe the answer is:
deli
'food shop' is the definition.
(short for delicatessen)
'deal in an abandoned' is the wordplay.
'abandoned' suggests deleting specific letters.
'deal'+'in'='dealin'
'dealin' with 'an' taken away is 'DELI'.
(Other definitions for deli that I've seen before include "Special shop" , "Fine food shop" , "Exotic food shop" , "food-store?" , "Unusual food shop" .)