Arranges books (6)
I believe the answer is:
orders
I believe this is a double definition.
'arranges' is the first definition.
('order' can be a synonym of 'arrange')
'books' is the second definition.
(I've seen this before)
(Other definitions for orders that I've seen before include "Groups living under particular religious rules" , "taken by clergymen" , "'Decrees, edicts (6)'" , "Directs" , "customer's requests?" .)