You may eat it during the Christmas holiday (4)

I believe the answer is:

mash

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

'you may eat it' is the definition.
I can't tell whether this defines the answer.

'during the christmas holiday' is the wordplay.
'during' indicates the answer is hidden within the clue.
'MASH' is hidden within 'christmas holiday'.

Can you help me to learn more?

(Other definitions for mash that I've seen before include "Creamed potatoes" , "Crush, potatoes say" , "Pulverise" , "Reduce to pulp" , "Food for horses" .)

I've seen this clue in the Evening Standard.

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