Accountant in car somewhere on Dartmoor? (7)

I believe the answer is:

auditor

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'accountant' is the definition.
(I know that auditor is a type of accountant)

'car somewhere on dartmoor?' is the wordplay.
'car' becomes 'audi' (Audi is a German car brand).
'somewhere on dartmoor?' becomes 'tor' (I can't justify this - if you can you should believe this answer much more).
'audi'+'tor'='AUDITOR'

'in' is the link.

Can you help me to learn more?

(Other definitions for auditor that I've seen before include "Listener; scrutineer" , "Accounts inspector" , "Financial checker" , "Person who listens" , "One who checks accounts" .)

I've seen this clue in The Times.

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