Raged, being terribly ardent (6)
I believe the answer is:
ranted
'raged' is the definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Maybe you can see an association between them that I don't see?
'terribly ardent' is the wordplay.
'terribly' is an anagram indicator.
'ardent' is an anagram of 'RANTED'.
'being' acts as a link.
Can you help me to learn more?
(Other definitions for ranted that I've seen before include "Talked wildly and angrily" , "Went off" , "Spoke wildly and incoherently" , "Talked wildly, harangued" , "Spoke wildly and foolishly" .)