Peach biscuit (7)

I believe the answer is:

cracker

I believe this is a double definition.

'peach' is the first definition.
(in sense of something exceptionally good)

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

(Other definitions for cracker that I've seen before include "Biscuit for cheese" , "Savoury biscuit" , "Knockout biscuit?" , "Excellent" , "pulled at Christmas?" .)

I've seen this clue in The Guardian.

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