A golf rep playing a game (8)
I believe the answer is:
leapfrog
'a game' is the definition.
(leapfrog is a kind of game)
'a golf rep playing' is the wordplay.
'playing' indicates anagramming the letters.
'a'+'golf'+'rep'='agolfrep'
'agolfrep' is an anagram of 'LEAPFROG'.
(Other definitions for leapfrog that I've seen before include "Child's game of jumping over other children" , "Child's game of jumping over competitors" , "Advance by jumps" , "Game in which players vault over each other" , "Advance by jumping over the opposition" .)