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He's good at karate (3)


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'he's' 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 "book (abbreviated version)" , "Karate expert" , "Skill level in judo" , "-- Dare, comic hero" , "Man's name; judo grade" .)

I've seen this clue in The Mirror.
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