Loud sound from family gathering’s conclusion (5)
I believe the answer is:
clang
'loud sound' is the definition.
'family gathering's conclusion' is the wordplay.
'family' becomes 'clan' (I've seen this before).
'conclusion' says to take the final letters.
The final letter of 'gathering' is 'g'.
'clan'+'g'='CLANG'
'from' acts as a link.
(Other definitions for clang that I've seen before include "Dull sound of a bell" , "Ring loud and deep" , "Loud resonant metallic sound" , "Ring like a bell" , "Noise as of cymbals" .)