Moderate constant urge (7)
I believe the answer is:
chasten
This clue might be a double definition.
'moderate' is the first definition.
(synonyms)
'constant urge' is the second definition.
The answer and definition can be both to do with communicating as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?
Can you help me to learn more?
(Other definitions for chasten that I've seen before include "Subdue pride of with a stench" , "Subdue - a stench (anag)" , "Castigate or punish" , "Punish, purify" , "Subdue, correct by punishing" .)