Forceful motorist is doing this (7)
I believe the answer is:
driving
'forceful' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for driving that I've seen before include "Motorist's activity" , "Controlling; motoring" , "Hitting a golf ball off a tee" , "In charge of a motor vehicle" , "Pressing forward - in a car" .)