Crossword Genius

Rogue landscapers stripping borders of plants: their days are numbered! (9)

Ross

I believe the answer is:

calendars

I'm a little stuck... Click here to teach me more about this clue!

'their days are numbered' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for calendars that I've seen before include "Lists of days, weeks, months" , "Tabular arrays of days" .)

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