Ecclesiast's first religious book is a typical example (7)
I believe the answer is:
epitome
'a typical example' is the definition.
'ecclesiast's first religious book' is the wordplay.
'first' says to take the initial letters.
'religious' becomes 'pi'.
'book' becomes 'tome' (tome is a kind of book).
The first letter of 'ecclesiast' is 'e'.
'e'+'pi'+'tome'='EPITOME'
'is' is the link.
(Other definitions for epitome that I've seen before include "Digest" , "Abstract" , "Perfect example of a quality" , "Embodiment, type" , "Embodiment or perfect example" .)