Binds books (7)
I believe the answer is:
engages
This could be a double definition.
'binds' is the first definition.
The answer and definition can be both to do with communicating as well as being verbs in their -s form.
Perhaps you can see an association between them that I can't see?
'books' is the second definition.
(book can mean to book or engage someone's services)
Can you help me to learn more?
(Other definitions for engages that I've seen before include "Employs, hires" , "books" .)