Shouted, terribly ardent (6)
I believe the answer is:
ranted
'shouted' is the definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Perhaps there's an association 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 "Went off" , "Raved, spouted" , "Spoke wildly and loudly" , "Spoke wildly in ardent manner" , "Raved, mouthed off" .)