About going by car, nullifying the decision (10)

I believe the answer is:

overriding

I'm a little stuck... Click here to teach me more about this clue!

'car nullifying the decision' is the definition.
I can't tell whether this defines the answer.

'about going' is the wordplay.
'about' becomes 'over' (I've seen this before).
'going' becomes 'riding' (riding is a kind of going).
'over'+'riding'='OVERRIDING'

'by' is the link.

Can you help me to learn more?

(Other definitions for overriding that I've seen before include "most important" , "taking precedence" .)

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.