Perfect example I found in record book (7)
I believe the answer is:
epitome
'perfect example' is the definition.
(I've seen this before)
'i found in record book' is the wordplay.
'found in' means one lot of letters goes inside another.
'record' becomes 'ep'.
'book' becomes 'tome' (tome is a kind of book**).
'ep'+'tome'='eptome'
'i' put inside 'eptome' is 'EPITOME'.
(Other definitions for epitome that I've seen before include "Summary; embodiment" , "Digest" , "Model" , "Summary of a written work" , "Essence or embodiment" .)