Peer of incomparable quality (5)
I believe the answer is:
equal
'peer' is the definition.
('equal' can be a synonym of 'peer')
'of incomparable quality' is the wordplay.
'of' indicates the answer is hidden within the clue.
'EQUAL' is hidden in the letters of 'incomparable quality'.
(Other definitions for equal that I've seen before include "Peer; evenly balanced" , "Match; peer" , "The same in quantity, status etc" , "Numerically identical" , "Like revolting farm animals" .)