Royal fur (6)
I believe the answer is:
ermine
'royal fur' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ermine that I've seen before include "White-coated stoat" , "White fur of stoat" , "Stoat in northern regions" , "Fur trimming on royal robes" , "'Trimming on royal robes, say (6)'" .)