Martial arts experts visiting Greek port (6)

I believe the answer is:

gdansk

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'port' is the definition.
(port in Poland)

'martial arts experts visiting greek' is the wordplay.
'martial arts experts' becomes 'dans' (I can't explain this - if you can you should give a lot more credence to this answer).
'visiting' is an insertion indicator.
'greek' becomes 'gk'.
'dans' placed into 'gk' is 'GDANSK'.

Can you help me to learn more?

(Other definitions for gdansk that I've seen before include "Polish town" , "Port city of Poland" , "Polish coastal city" , "Polish seaport" , "Major Polish port" .)

I've seen this clue in The Independent.

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