One for the record books? (5)
I believe the answer is:
clerk
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">one for the record books?</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for clerk that I've seen before include "Record-keeper" , "Office/bank worker" , "Office record keeper" , "Office worker (UK) - shop assistant (US)" , "Record- or account-keeper" .)