Wrestling style (4)
I believe the answer is:
sumo
'wrestling style' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sumo that I've seen before include "Japanese wrestling sport of over-weight men" , "Style of traditional Japanese wrestling" , "Japanese wrestling for huge men" , "Japanese form of wrestling" , "one of the martial arts" .)