Collide with front of stationary three-wheeler (6)
I believe the answer is:
strike
'collide with' is the definition.
('strike' can be a synonym of 'collide with')
'front of stationary three-wheeler' is the wordplay.
'front of' says to take the initial letters.
'three-wheeler' becomes 'trike' (I've seen this before).
The initial letter of 'stationary' is 's'.
's'+'trike'='STRIKE'
(Other definitions for strike that I've seen before include "success for bowler" , "Walk-out" , "Industrial dispute - everybody out" , "Work stoppage over industrial dispute" , "Hit; withhold labour" .)