Crossword Genius

Roman poet loses his third watch (5)

Ross

I believe the answer is:

vigil

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'watch' is the definition.
(to keep vigil is to keep watch)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for vigil that I've seen before include "Period of 9" , "Watchful night" , "Through the night, one kept" , "observance" , "Night service; watch" .)

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