Peers, matches (6)
I believe the answer is:
equals
I believe this clue is a double definition.
'peers' is the first definition.
('equal' can be a synonym of 'peer')
'matches' is the second definition.
('equal' can be a synonym of 'match')
(Other definitions for equals that I've seen before include "Those with the same status, rights, etc." , "Corresponds to" , "Is as good as" , "Persons of the same rank, for instance" , "Peers, matches" .)