Stoat with a winter coat (6)

I believe the answer is:

ermine

(Other definitions for ermine that I've seen before include "White fur of weasel" , "Fur-bearing mammal" , "Animal with brown fur that turns white in winter" , "Fur trimming on royal robes" , "White fur from kind of 25 Across - judges may wear it" .)

I've seen this clue in the Universal.

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