Unmatched, peerless (9)
I believe the answer is:
nonpareil
This clue is a double definition.
'unmatched' is the first definition.
(synonyms)
'peerless' is the second definition.
(synonyms)
(Other definitions for nonpareil that I've seen before include "Unrivalled person/thing" , "ideal" , "Eminent beyond comparison" , "without peers" , "beyond compare" .)