Crossword Genius

A journal whose days are numbered (5)

Ross

I believe the answer is:

diary

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'a journal' is the definition.
('diary' can be a synonym of 'journal')

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for diary that I've seen before include "personal account" , "Record of events" , "Pepys' daily record" , "Personal journal" , "Personal record book" .)

I've seen this clue in The Globe and Mail.
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