A man, among the best ever (5)
I believe the answer is:
steve
'a man' is the definition.
'among the best ever' is the wordplay.
'among' indicates a hidden word.
'STEVE' is hidden in the letters of 'best ever'.
(Other definitions for steve that I've seen before include "Byers, to his friends" , "Sir - - Redgrave (oarsman)" , "- - Harmison (bowler)" , "- Reich; - Biko" , "Chap" .)