Furry animal that’s totally different in summer (6)
I believe the answer is:
ermine
'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" .)