Hide outside? (3)

I believe the answer is:

fur

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But I can't explain it at all! Could you help me understand?

(Other definitions for fur that I've seen before include "Hide" , "Expensive coat; deposit in kettle" , "Hairy animal coat" , "Coating formed on sick person's tongue (3)" , "Coating in kettle" .)

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

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