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Diarist has a furtive look, reportedly (5)

Ross

I believe the answer is:

pepys

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'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" .)

I've seen this clue in The Guardian.
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