Crossword Genius

A man belted at karate (3)

Ross

I believe the answer is:

dan

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'a man' is the definition.

I cannot understand how the rest of the clue works.

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(Other definitions for dan that I've seen before include "Grade of judo black belt" , "Dark and damp." , "Expertise level in juso" , "Jacob's fourth son" , "book (abbreviated version)" .)

I've seen this clue in The Globe and Mail.
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