Car wheel making sound (5)
I believe the answer is:
audio
'sound' is the definition.
(audio means sound)
'car wheel' is the wordplay.
'car' becomes 'audi' (Audi is a German car brand).
'wheel' becomes 'O' (O looks like a wheel).
'audi'+'o'='AUDIO'
'making' is the link.
(Other definitions for audio that I've seen before include "Sound broadcast" , "Reproduced sound" , "Denoting sound" , "TV sound" , "Acoustic reproduction" .)