Upright citizens of Krakow, say (5)

I believe the answer is:

poles

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'upright citizens' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps there's a link between them I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for poles that I've seen before include "Rods of wood or metal" , "Nationality of citizens of Warsaw" , "North and south" , "Extremities of the earth's axis" , "People from Warsaw?" .)

I've seen this clue in the Evening Standard.

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