Sandwich seller (4)
I believe the answer is:
deli
'sandwich seller' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for deli that I've seen before include "Specialist foodshop(abbr.)" , "Food shop (abbr)" , "Specialist food shop" , "Fine-food store" , "Food shop or counter" .)