Give out old books to everybody (5)
I believe the answer is:
allot
'give out' is the definition.
(I've seen this before)
'old books to everybody' is the wordplay.
'old books' becomes 'ot' (Old Testament).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'everybody' becomes 'all' (I've seen this before).
'ot' after 'all' is 'ALLOT'.
(Other definitions for allot that I've seen before include "Distribute in portions" , "grant" , "split up" , "Assign or distribute" , "Apportion (something to someone)" .)