Crossword Genius

What to do with visitors - look for a fight? (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!

'visitors look for a fight?' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'what to do' is the wordplay.
I cannot really understand how this works, but
'do' could be 'ut' (synonyms) and 'ut' is present in the answer.
This explanation may well be incorrect...

'with' is the link.

Can you help me to learn more?

I've seen this clue in The Irish Times.
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