Without equal (6)
'without equal' is the definition.
('equal' can be 'peer' (synonyms) so maybe 'without equal' can be ''peerless')
This is all the clue.
(Other definitions for peerless that I've seen before include "Unparalleled, incomparable" , "Unequalled" , "Without equal, nonpareil" , "No Iolanthe performance could be so" , "Without equal, matchless" .)
(Other definitions for nonesuch that I've seen before include "Perfect example" , "Black medick" , "Matchless thing" , "Excellent thing" , "One who had no equal, a paragon" .)
'without equal' is the definition.
(something unique has no equal)
This is the entire clue.
(Other definitions for unique that I've seen before include "Radically distinctive and without equal" , "Singular, different from others" , "Without equal or like" , "Singular, without equal" , "One-off" .)