One in record book, typical example (7)
I believe the answer is:
epitome
'typical example' is the definition.
'one in record book' is the wordplay.
'one' becomes 'i' (Roman numeral).
'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 "Perfect example of a quality" , "Summary of a written work" , "Paradigm" , "ie Tempo (anag.)" , "Summary; embodiment" .)