Son with three-wheeled vehicle gets hit (6)
I believe the answer is:
strike
'hit' is the definition.
('strike' can be a synonym of 'hit')
'son with three-wheeled vehicle' is the wordplay.
'son' becomes 's'.
'with' means one lot of letters go next to another.
'three-wheeled vehicle' becomes 'trike' (I've seen this before).
's'+'trike'='STRIKE'
'gets' acts as a link.
(Other definitions for strike that I've seen before include "Attack - industrial action" , "Failure to hit ball" , "Hit the labour withdrawal" , "Everyone out" , "Work stoppage over industrial dispute" .)