Fur provided by bishop in market transaction (5)
I believe the answer is:
sable
'fur' is the definition.
(I know that sable is a type of fur)
'bishop in market transaction' is the wordplay.
'bishop' becomes 'B' (chess abbreviation).
'in' means one lot of letters goes inside another.
'market transaction' becomes 'sale' (I've seen this in another clue).
'b' going into 'sale' is 'SABLE'.
'provided by' acts as a link.
(Other definitions for sable that I've seen before include "Black; antelope" , "Black (heraldry); fur" , "Literary black" , "Brush" , "Marten's fur - dark black" .)