Dark fur (5)
I believe the answer is:
sable
'dark fur' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sable that I've seen before include "Literary black" , "Marten's fur - dark black" , "Fur from member of weasel family" , "Fur - heraldic black" , "Bales of rich fur" .)