Crossword Genius

On hearing car, someone leaning to the right (8)

Ross

I believe the answer is:

auditory

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

'on hearing' is the definition.
(I know this)

'car someone leaning to the right' is the wordplay.
I cannot really understand how this works, but
'car' could be 'audi' (Audi is a German car brand) and 'audi' is found within the answer.
'someone' could be 'tory' (Tory is an example) and 'tory' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for auditory that I've seen before include "Related to the sense of hearing" , "as one hears" , "Relating to hearing" , "Via the ears" .)

I've seen this clue in The Guardian.
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