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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.

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(Other definitions for pepys that I've seen before include "Renowned diarist", "Samuel -, English diarist", "English diarist and naval administrator, d. 1703", "Famous English diarist", "Diary-writer".)

I've seen this clue in The Guardian.
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