A buffet always contains cheese (4)

I believe the answer is:

feta

'cheese' is the definition.
(I've seen this before)

'a buffet always contains' is the wordplay.
'contains' indicates the answer is hidden within the clue.
'FETA' can be found hidden inside 'buffet always'.

(Other definitions for feta that I've seen before include "10 down cheese" , "Crumbly Greek cheese" , "Greek 8 across" , "Eastern Mediterranean cheese" , "Greek dairy product" .)

I've seen this clue in The Telegraph.

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