Crumbly Greek cheese (4)
I believe the answer is:
feta
'crumbly greek cheese' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for feta that I've seen before include "food there" , "Soft Greek cheese" , "Greek cheese from goat or sheep milk" , "Greek sheep or goats' cheese" , "Greek 8 across" .)