For mad chaps, evening out is a noisy free-for-all (6)
I believe the answer is:
fracas
'free-for-all' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for fracas that I've seen before include "Brawl, disturbance" , "Scrap" , "Trouble" , "Noisy altercation" , "Uproar - brawl" .)