Diarist has a furtive look, reportedly (5)
I believe the answer is:
pepys
'diarist' is the definition.
(I've seen this in another clue)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for pepys that I've seen before include "London diarist" , "Old writer" , "Samuel -, seventeenth century diarist" , "Renowned diarist" , "Famous diary keeper" .)