15 across provides School Charters (5)
I believe the answer is:
books
'charters' is the definition.
The definition and answer can be both related to communication as well as being plural nouns.
Perhaps there's a link between them I don't understand?
'15 across provides school' is the wordplay.
I cannot really understand how this works, but
'school' could be 's' and 's' is found in the answer.
The remaining letters 'book' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for books that I've seen before include "Reserves" , "See 1" , "Tomes, volumes" , "Reserve tickets" .)