Japanese wrestling form (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">japanese wrestling form</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sumo that I've seen before include "foreign form of fighting" , "Japanese wrestling for huge men" , "Large Japanese wrestler" , "slappers fighting?" , "Style of traditional Japanese wrestling" .)