A biscuit for Xmas? (7)

I believe the answer is:

cracker

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand the remainder of the clue.

(Other definitions for cracker that I've seen before include "Christmas table item" , "exceptional" , "Christmas firework" , "A stunning girl" , "that should be on the table tomorrow" .)

I've seen this clue in the Evening Standard.

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