Natural encores (6)
I believe the answer is:
echoes
'natural encores' is the definition.
The answer and definition can be both related to communication as well as being plural nouns.
Maybe there's an association between them I don't understand?
This is all the clue.
Can you help me to learn more?
(Other definitions for echoes that I've seen before include "Resounds, reverberates" , "Sounds heard again" , "Sound reverberations" , "Reflections of sound waves" , "Natural sound reflections" .)