Peer among those qualifying (5)
I believe the answer is:
equal
'peer' is the definition.
('equal' can be a synonym of 'peer')
'among those qualifying' is the wordplay.
'among' says the answer is hidden in the clue.
'EQUAL' can be found hidden inside 'those qualifying'.
(Other definitions for equal that I've seen before include "Peer; evenly balanced" , "Uniform" , "Evenly-matched" , "Like revolting farm animals" , "Peer; rival" .)