In returning, met a rake enjoying unarmed combat (6)
I believe the answer is:
karate
'unarmed combat' is the definition.
(I've seen this before)
'in returning met a rake enjoying' is the wordplay.
'returning' shows that the letters should be reversed in order.
'in' says the answer is hidden in the clue.
'etarak' is hidden in the letters of 'met a rake enjoying'.
'etarak' in reverse letter order is 'KARATE'.
(Other definitions for karate that I've seen before include "Martial art (with chopping?)" , "Japanese martial art" , "SPORT/GAME" , "Combative sport" , "A taker (anag)" .)