Avoid bumper car? Not quite (5)
I believe the answer is:
dodge
'avoid' is the definition.
(dodging is a kind of avoiding)
'bumper car? not quite' is the wordplay.
'bumper car?' becomes 'dodgem' ('Dodgem' can be a synonym of 'bumper car').
'not quite' means to remove the last letter.
'dodgem' with its final letter taken off is 'DODGE'.
(Other definitions for dodge that I've seen before include "Avoid by sudden movement" , "Avoid - old American car" , "Evade - sidestep" , "Avoid - Kansas city" , "bypass" .)