Characters showing relief from disturbed rest slept round about (11*)
I believe the answer is:
Here is my best explanation:
'characters showing' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'relief from disturbed rest slept round about' is the wordplay.
I cannot quite see how this works, but
'about' could be 're' (regarding) and 're' is found within the answer.
This explanation may well be incorrect...