Component of buffet - amazing cheese (4)
I believe the answer is:
feta
'cheese' is the definition.
(I've seen this before)
'component of buffet amazing' is the wordplay.
'component of' indicates a hidden word (I've seen this in other clues).
'FETA' is hidden in the letters of 'buffet amazing'.
(Other definitions for feta that I've seen before include "Eastern Mediterranean cheese" , "Salty goat or sheep milk cheese" , "10 down cheese" , "Greek 8 across" , "Goat's or sheep's milk cheese" .)