Raged, terribly ardent (6)
I believe the answer is:
ranted
'raged' is the definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Perhaps there's a link between them I don't understand?
'terribly ardent' is the wordplay.
'terribly' indicates anagramming the letters.
'ardent' is an anagram of 'RANTED'.
Can you help me to learn more?
(Other definitions for ranted that I've seen before include "Raved, mouthed off" , "Spoke wildly and loudly" , "Talked wildly, harangued" , "Spoke wildly and incoherently" , "Talked wildly and raved" .)