Pleased with what's inside (7)
I believe the answer is:
content
I believe this is a double definition.
'pleased with' is the first definition.
(thesaurus)
'what's inside' is the second definition.
(inside a book or article)
(Other definitions for content that I've seen before include "Gratify" , "Quietly happy" , "Satisfied, happy enough" , "state of peaceful happiness" , "Elements" .)