Country rodent keeps out cold (5)

I believe the answer is:

china

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'country' is the definition.
(I know that China is a sovereign state)

I don't understand the remainder of the clue.

(Other definitions for china that I've seen before include "Far Eastern power" , "The most populous country in the world" , "High quality porcelain" , "Porcelain; friend" , "Household ceramics" .)

I've seen this clue in The Telegraph.

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