Crossword Genius

Bit of a beast where food intake's concerned (3)

Ross

I believe the answer is:

maw

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

This could be a double definition.

'bit of a beast' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'where food intake's concerned' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

Can you help me to learn more?

(Other definitions for maw that I've seen before include "Crop of an animal" , "Stomach of men and animals" , "Mouth of a voracious animal - or an American mum?" , "Mouth of a vicious animal" , "Gaping mouth of voracious animal" .)

I've seen this clue in the Evening Standard.
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