Sandwich shop (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
deli
'sandwich shop' is the definition.
(short for delicatessen)
This is all the clue.
(Other definitions for deli that I've seen before include "Shop with unusual foods" , "part of supermarket" , "Exotic food shop" , "Specialist food shop" , "Food shop (abbr)" .)