Chaotic fight (5)
(Other definitions for brawl that I've seen before include "Rowdy scuffle" , "Riotous fight" , "Quarrel noisily" , "Rough, noisy fight" , "Affray" .)
'chaotic fight' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for melee that I've seen before include "confused group" , "Scrimmage" , "Confused crowd" , "Rumpus" , "Fracas" .)