A mixed grill could be just too much for her! (4)

I believe the answer is:

girl

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'a mixed grill' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for girl that I've seen before include "Maidservant" , "Miss" , "See 5" , "Lass" , "Maid" .)

I've seen this clue in the Evening Standard.

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