Crossword Genius

Martial art genius occasionally visiting this country, upset receiving fine (4,2)

Ross

I believe the answer is:

kung fu

I'm a little stuck... Click here to teach me more about this clue!

This clue could be a double definition.

'martial art' is the first definition.
(Kung Fu is an example)

'genius occasionally visiting this country upset receiving fine' is the second definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

Can you help me to learn more?

(Other definitions for kung fu that I've seen before include "Unarmed Chinese martial art" , "Chinese type of karate" , "Chinese form of unarmed combat, was a TV serial" , "Chinese system of unarmed combat like karate" , "fighting" .)

I've seen this clue in The Telegraph.
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