First part of index in record book, for example (7)
I believe the answer is:
epitome
'example' is the definition.
(epitome is a kind of example)
'first part of index in record book' is the wordplay.
'first part of' suggests taking the first letters.
'in' means one lot of letters goes inside another.
'record' becomes 'ep'.
'book' becomes 'tome' (tome is a kind of book**).
The initial letter of 'index' is 'i'.
'ep'+'tome'='eptome'
'i' going within 'eptome' is 'EPITOME'.
'for' acts as a link.
(Other definitions for epitome that I've seen before include "Paradigm" , "Embodiment or perfect example" , "Embodiment, type" , "Exemplar - embodiment" , "Summary; embodiment" .)