German car wheel and sound system (5)

I believe the answer is:

audio

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'sound system' is the definition.
(I've seen this before)

'german car wheel' is the wordplay.
'german car' becomes 'audi'.
'wheel' becomes 'o' (I can't explain this - if you can you should believe this answer much more).
'audi'+'o'='AUDIO'

'and' acts as a link.

Can you help me to learn more?

(Other definitions for audio that I've seen before include "TV sound" , "Electronic sound reproduction" , "Relating to sound or hearing" , "Denoting sound" , "Television sound" .)

I've seen this clue in The Sun.

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