Collided with small lorry (6)
I believe the answer is:
struck
'collided' is the definition.
(I've seen this before)
'with small lorry' is the wordplay.
'with' is a charade indicator (letters next to each other).
'small' becomes 's' (abbreviation - e.g. clothes size).
'lorry' becomes 'truck' (I've seen this before).
's' next to 'truck' is 'STRUCK'.
(Other definitions for struck that I've seen before include "Found" , "Hit; sounded (hour)" , "set out" , "Hit; stopped work" , "stopped working" .)