Creature highly exposed on burrow (6)

I believe the answer is:

ermine

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'creature' is the definition.
(thesaurus)

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

(Other definitions for ermine that I've seen before include "Fur trimming on royal robes" , "Regal fur" , "Stoat in northern regions" , "Stoat's winter fur" , "Winter fur of the stoat" .)

I've seen this clue in The Times.

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