Corned beef seller (4)
I believe the answer is:
deli
'corned beef 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 store" , "food outlet" , "Shop selling processed food products" , "part of supermarket" .)