Crossword Genius

Very different – like those in Cracow and those in Gdansk? (5,5)

Ross

I believe the answer is:

poles apart

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'very different' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for poles apart that I've seen before include "having nothing in common" , "some Europeans?" , "with widely differing views" , "Differing greatly" , "Incompatible" .)

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