Jump to put an end to game (9)
I believe the answer is:
hopscotch
'to game' is the definition.
(hopscotch is a kind of game)
'jump to put an end' is the wordplay.
'jump' becomes 'hop' (hop is a kind of jump).
'to put an end' becomes 'scotch' (I've seen this before).
'hop'+'scotch'='HOPSCOTCH'
(Other definitions for hopscotch that I've seen before include "Children's game with squares on ground" , "minor diversion?" , "Traditional children's game" , "child's play" , "Jumping game" .)