Long for some feta cheese (4)
I believe the answer is:
ache
'long for' is the definition.
(I've seen this in another clue)
'some feta cheese' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'ACHE' is hidden in the letters of 'feta cheese'.
(Other definitions for ache that I've seen before include "Persistent dull pain" , "Shakespearean character" , "Hurt; yearn" , "Take an aspirin for it" , "yearning" .)