Crossword Genius

15 across provides School Charters (5)

Ross

I believe the answer is:

books

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in the Irish Times.
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