The judo expert? (3)

I believe the answer is:

dan

'the judo expert?' is the definition.
(ranking system in Judo)

This is the entire clue.

(Other definitions for dan that I've seen before include "Judo, karate level" , "Expertise level in juso" , "Grade of proficiency in judo" , "Judo level and Wicklow lake" , "Karate expert" .)

I've seen this clue in the Evening Standard.

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