Nonpareil (8)
I believe the answer is:
peerless
'nonpareil' is the definition.
(I know that nonpareil can be written as peerless)
This is the entire clue.
(Other definitions for peerless that I've seen before include "Without equal, matchless" , "superb" , "Unparalleled, incomparable" , "Unequalled" , "Unrivalled" .)