Dojo degree (3)
I believe the answer is:
dan
'dojo degree' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dan that I've seen before include "Grade of judo black belt" , "Black-belt grade of proficiency" , "Judo level and Wicklow lake" , "Judo level of proficiency (3)" , "Level of proficiency in Japanese combative sport" .)