Inspect German car and old Ford model (5)

I believe the answer is:

audit

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'inspect' is the definition.
(synonyms)

'german car and old ford model' is the wordplay.
'german car' becomes 'audi' (I've seen this in another clue).
'and' is a charade indicator (letters next to each other).
'old ford model' becomes 't' (I can't explain this - if you can you should believe this answer much more).
'audi'+'t'='AUDIT'

Can you help me to learn more?

(Other definitions for audit that I've seen before include "Stocktake" , "Roman Aquae Sulis" , "Check of books" , "HMRC inspection" , "Inspection of records" .)

I've seen this clue in The Sun.

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