Shouted, terribly ardent (6)
I believe the answer is:
ranted
'shouted' is the definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Maybe they are linked in a way I don't understand?
'terribly ardent' is the wordplay.
'terribly' is an anagram indicator.
'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" .)