Renowned diarist (5)
I believe the answer is:
pepys
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">renowned diarist</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pepys that I've seen before include "Samuel ---, C seventeen Admiralty secretary" , "Samuel, diarist, d. 1703" , "Renowned diarist" , "Famous English diarist" , "English civil servant and diarist, d. 1703" .)