The vulgar fellow made beastly noises (5)
I believe the answer is:
lowed
'made beastly noises' is the definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Perhaps you can see an association between them that I can't see?
'the vulgar fellow' is the wordplay.
'the vulgar' becomes 'low'.
'fellow' becomes 'ed' (short for Edward).
'low'+'ed'='LOWED'
Can you help me to learn more?
(Other definitions for lowed that I've seen before include "made noises like farm animals" , "How Jersey communicated" , "Mooed" .)