Game jumper (7)
I believe the answer is:
cricket
I believe this is a double definition.
'game' is the first definition.
(cricket is a kind of game)
'jumper' is the second definition.
(I've seen this before)
(Other definitions for cricket that I've seen before include "a jumper" , "Summer sport" , "Six-footer" , "little creature" , "English game or chirping insect" .)