A cheese (4)
I believe the answer is:
brie
'a cheese' is the definition.
(I know that Brie is a type of cheese)
This is all the clue.
(Other definitions for brie that I've seen before include "cheese-producing region" , "Variety of cheese" , "Round soft Fr. cheese" , "French cream cheese" , "Prov. squalid place" .)