Crossword Genius

What to do with guests making fighting challenge? (3,2,2)

Ross

I believe the answer is:

put em up

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

'guests making fighting challenge?' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'what to do' is the wordplay.
I cannot quite see how this works, but
'do' could be 'ut' (synonyms) and 'ut' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

'with' is the link.

Can you help me to learn more?

I've seen this clue in The Guardian.
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