Motivation to be a motorist (5)
I believe the answer is:
drive
'motivation' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for drive that I've seen before include "Car journey; urge" , "Ambition - steer" , "gear" , "offensive" , "first shot" .)