Drink and a piece of cake first (5)

I believe the answer is:

kefir

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

'a piece of cake first' is the wordplay.
'a piece of' says the answer is hidden in the clue.
'KEFIR' can be found hidden inside 'cake first'.

'and' acts as a link.

(Another definition for kefir that I've seen is " Drink".)

I've seen this clue in The Telegraph.

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