Crossword Genius

Furry animal that’s totally different in summer (6)

Ross

I believe the answer is:

ermine

I'm a little stuck... Click here to teach me more about this clue!

'furry animal' is the definition.
'ermine' can be an answer for 'animal' (thesaurus). I am not certain of the 'furry' bit.

'totally different in summer' is the wordplay.
I cannot really see how this works, but
'in' is present in the answer.
This may be the basis of clue (or it may be nonsense).

'that's' acts as a link.

Can you help me to learn more?

(Other definitions for ermine that I've seen before include "Animal with brown fur that turns white in winter" , "Ceremonial fur" , "Warm white covering" , "Expensive white fur" , "Stoat's winter fur" .)

I've seen this clue in the Evening Standard.
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