Collided with small vehicle (6)
I believe the answer is:
struck
'collided' is the definition.
(I've seen this before)
'with small vehicle' is the wordplay.
'with' is a charade indicator (letters next to each other).
'small' becomes 's' (abbreviation - e.g. clothes size).
'vehicle' becomes 'truck' (truck is a kind of vehicle).
's' next to 'truck' is 'STRUCK'.
(Other definitions for struck that I've seen before include "Punched" , "'Hit, slapped (6)'" , "Hit; stopped work" , "(Of clock) chimed" , "Hit as by lightning" .)