Run from vehicles on the road (7)
I believe the answer is:
traffic
I believe this clue is a double definition.
'run' is the first definition.
(e.g. drugs, contraband)
'vehicles on the road' is the second definition.
(I've seen this before)
'from' is the link.
(Other definitions for traffic that I've seen before include "Movement of vehicles" , "dealings" , "Smuggle" , "Illegal trading" , "Lots of vehicles" .)