An upright citizen of Kraków, perhaps (4)

I believe the answer is:

pole

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'an upright' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

(Other definitions for pole that I've seen before include "Magnet end" , "Round rod of wood or metal" , "One of two opposites" , "European - flag bearer" , "support" .)

I've seen this clue in the Evening Standard.

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