By scorning traybake, they become mixed up in physical combat (6)
I believe the answer is:
karate
'combat' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for karate that I've seen before include "Martial art (with chopping?)" , "Unarmed-combat system" , "Japanese system of unarmed combat" , "A taker (anag)" , "Japanese art of unarmed combat" .)