Grappling sport (4)
I believe the answer is:
sumo
'grappling sport' 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 "slappers fighting?" , "Type of Japanese wrestling" , "one of the martial arts" , "Jap. wrestling" , "Grappling" .)