Pinball game ender (4)
I believe the answer is:
tilt
'pinball game ender' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tilt that I've seen before include "Slant - joust" , "Thrust with lance, like Don Quixote at windmills" , "Joust; bias" , "Inclination, joust" , "Incline, lean" .)