Satisfied with small part of book (8)
I believe the answer is:
contents
'part of book' is the definition.
(I know that contents part of book)
'satisfied with small' is the wordplay.
'satisfied' becomes 'content' (similar in meaning).
'with' says to put letters next to each other.
'small' becomes 's' (abbreviation - e.g. clothes size).
'content'+'s'='CONTENTS'
(Other definitions for contents that I've seen before include "constituents" , "List of what's included" , "Satisfies the list of chapters" , "What's inside" , "List of everything included" .)