Sound one included in prominent feature (5)
I believe the answer is:
noise
'sound' is the definition.
(a noise is a sound)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for noise that I've seen before include "Hubbub" , "Din, cacophony" , "Excessive sound" , "Uproar" , "Racket, din" .)