Pal of Reg organised game (8)
I believe the answer is:
leapfrog
'game' is the definition.
(leapfrog is a kind of game)
'pal of reg organised' is the wordplay.
'organised' indicates an anagram.
'pal'+'of'+'reg'='palofreg'
'palofreg' is an anagram of 'LEAPFROG'.
(Other definitions for leapfrog that I've seen before include "Game in which players vault over each other" , "Advance by jumps" , "Game in which one child jumps over another" , "bound over" , "Vaulting game" .)