Crave feta cheese sandwiches (4)
I believe the answer is:
ache
'crave' is the definition.
(I've seen this in another clue)
'feta cheese sandwiches' is the wordplay.
'sandwiches' indicates a hidden word (the answer is sandwiched in by the clue).
'ACHE' can be found hidden inside 'feta cheese'.
(Other definitions for ache that I've seen before include "Continuous hurt" , "suffering" , "burn" , "anguish" , "Twinge" .)