Fist fight ( Informal ) (5-2)

I believe the answer is:

punch-up

(Other definitions for punch-up that I've seen before include "Street brawl" , "Fisticuffs incident" , "An informal fist-fight or brawl - strike vertically?" , "Brawl (colloq.)" , "Fist fight" .)

I've seen this clue in The Independent.

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