Crossword Genius

Part where two players can pack a punch? (9,5)

Ross

I believe the answer is:

pantomime horse

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

'punch?' is the definition.
I know nothing about this answer so I can't judge whether this works.

'part where two players can pack a' is the wordplay.
I cannot quite understand how this works, but
'part' could be 'mi' (mi is a kind of part) and 'mi' is present in the answer.
'a' could be 'an' and 'an' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for pantomime horse that I've seen before include "Christmas double act" , "Christmas show character" , "Costume for two performers" .)

I've seen this clue in The Times.
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