Crossword Genius

Fellow is drunk, involving another in punch-up (9)

Ross

I believe the answer is:

fistfight

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

'punch-up' is the definition.
(both can mean a fight)

'fellow is drunk involving another' is the wordplay.
I cannot really see how this works, but
'fellow' could be 'f' (abbreviation - of a society etc.) and 'f' is found in the answer.
'is' is present in the answer.
This explanation may well be incorrect...

'in' is the link.

Can you help me to learn more?

I've seen this clue in The Daily Express.
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