Trip put an end to children's game (9)
I believe the answer is:
hopscotch
'children's game' is the definition.
(playground game)
'trip put an end to' is the wordplay.
'trip' becomes 'hop' (I have seen 'Short trip ' mean 'hop' so perhaps 'trip' could also mean 'hop').
'put an end to' 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" , "childish amusement" , "Traditional children's game" , "Playground game" , "Jumping game" .)