Honbasho sport (4)

I believe the answer is:

sumo

(Other definitions for sumo that I've seen before include "foreign form of fighting" , "Grappling" , "Style of traditional Japanese wrestling" , "Japanese wrestling with big fat men" , "Traditional Japanese wrestling by fat men" .)

I've seen this clue in the LA Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.