Sound car gets round (5)
I believe the answer is:
audio
'sound' is the definition.
('audio' can be a synonym of 'sound')
'car gets round' is the wordplay.
'car' becomes 'audi' (audi is a german car brand**).
'gets round' becomes 'o' (I've seen this in other clues).
'audi'+'o'='AUDIO'
(Other definitions for audio that I've seen before include "- Tape; - typist" , "Sound broadcast" , "Car" , "shown in reproduction" , "Sound recording" .)