Let me see setter’s fur (6)
I believe the answer is:
ermine
'fur' is the definition.
(ermine is a kind of fur)
'let me see setter's' is the wordplay.
'let me see' becomes 'er' (Synonym).
'setter's' becomes 'mine' (what belongs to the crossword setter).
'er'+'mine'='ERMINE'
(Other definitions for ermine that I've seen before include "'Trimming on royal robes, say (6)'" , "Stoat in its winter coat" , "White fur of weasel" , "Expensive white fur" , "Stoat in northern regions" .)