Sound family group, note (5)
I believe the answer is:
clang
'sound' is the definition.
(I know that clang is a type of noise)
'family group note' is the wordplay.
'family group' becomes 'clan' (I've seen this before).
'note' becomes 'g' (musical note).
'clan'+'g'='CLANG'
(Other definitions for clang that I've seen before include "Noise as of cymbals" , "Jangle" , "Resounding effect" , "Loud resonant noise" , "Loud resonant metallic sound" .)