But Arctic fur doesn't come from it (7)

I believe the answer is:

polecat

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'but arctic fur' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe there's an association between them I don't understand?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for polecat that I've seen before include "Weasel-like creature" , "Smelly American mammal" , "weaselly creature" , "Kind of weasel, called skunk in America" , "Smelly animal" .)

I've seen this clue in The Globe and Mail.

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