Books about staplers (8)
I believe the answer is:
psalters
'books' is the definition.
(Psalter is an example)
'about staplers' is the wordplay.
'about' is an anagram indicator.
'staplers' anagrammed gives 'PSALTERS'.
(Other definitions for psalters that I've seen before include "religious books" , "Versions of the Book of Psalms" , "Books of Psalms" , "liturgical books" .)