Ceremonial sport (4)
I believe the answer is:
sumo
'ceremonial 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 "Japanese wrestling sport of over-weight men" , "Jap. wrestling" , "slappers fighting?" , "Large Japanese wrestler" , "Japanese form of wrestling" .)