Famous diarist (5)
I believe the answer is:
pepys
'famous diarist' is the definition.
(Samuel Pepys, 1633-1703)
This is all the clue.
(Other definitions for pepys that I've seen before include "English civil servant and diarist, d. 1703" , "Old writer" , "Journalist" , "Samuel -, seventeenth century diarist" , "English diarist and naval administrator, d. 1703" .)