Possible Clues:

• Deal illegally, in vehicles?
• There's a fir over the road and that's a fact
• Import-export trade
• This causes noise on city streets
• Jerk nabbing a blackguard for dealing
• Word that can precede the last word of 17- and 63-Across and 10- and 25-Down
• Passing vehicles - trade
• Jam ingredient
• RAC tiff about cars on the road
• Deal with cars etc