Crossword Genius

Non-U Tory following in car unlikely to be caught? (9)

Ross

I believe the answer is:

inaudible

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

'unlikely to be caught?' is the definition.
I can't tell whether this definition defines the answer.

'non-u tory following in car' is the wordplay.
'non' is a deletion indicator.
'tory' becomes 'blue' (blue can mean relating to the Conservative Party).
'following' means one lot of letters go next to another.
'car' becomes 'audi' (Audi is a German car brand).
'blue' with 'u' removed is 'ble'.
'in'+'audi'='inaudi'
'ble' after 'inaudi' is 'INAUDIBLE'.

Can you help me to learn more?

(Other definitions for inaudible that I've seen before include "impossible to grasp" , "Cannot be heard" , "Unable to be heard" , "Impossible to hear" , "Not aurally detectible" .)

I've seen this clue in The Telegraph.
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