He barks loud words at wedding (4)
I believe the answer is:
fido
'he barks' is the definition.
The definition suggests a singular noun which matches the answer.
'loud words at wedding' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'words at wedding' becomes 'i do' (wedding vows).
'f'+'ido'='FIDO'
Can you help me to learn more?
(Other definitions for fido that I've seen before include "it would disperse fog" , "Dog perhaps" , "Fog disperser" , "Typical dog's name" .)