Pinball no-no (4)
I believe the answer is:
tilt
'pinball no-no' 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 "Lean sideways" , "Incline - joust" , "Be inclined" , "Slope, slant" , "Incline, slant" .)