Fast driver: note vehicle overturning (5)
I believe the answer is:
racer
'fast driver' is the definition.
(I've seen this before)
'note vehicle overturning' is the wordplay.
'note' becomes 're' (**).
'vehicle' becomes 'car' (car is a kind of vehicle).
'overturning' says the letters should be written in reverse.
're'+'car'='recar'
'recar' backwards is 'RACER'.
(Other definitions for racer that I've seen before include "sportsman" , "one in a hurry" , "Athlete" , "Bike, perhaps" , "One car" .)