Car with old sound (5)

I believe the answer is:

audio

'sound' is the definition.
(audio means sound)

'car with old' is the wordplay.
'car' becomes 'audi' (Audi is a German car brand).
'with' says to put letters next to each other.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'audi'+'o'='AUDIO'

(Other definitions for audio that I've seen before include "Acoustic reproduction" , "Car" , "- - visual aids" , "Electronic sound reproduction" , "Sound broadcast" .)

I've seen this clue in The Guardian.

Want a hint initially instead of a full solution? Install my app