Names dutifully listed (4)
I believe the answer is:
rota
'names' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for rota that I've seen before include "Duty roster" , "List of duties taken in turn" , "Work roster" , "Repetitious canon" , "List assigning turns of duty" .)