Cheese in a Greek salad (4)
I believe the answer is:
feta
'cheese in a greek salad' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for feta that I've seen before include "Soft Greek cheese" , "Goat's or sheep's milk cheese" , "Crumbly Greek cheese" , "White Greek cheese" , "A ewe's, goat's milk cheese" .)