Crossword Genius

Muse has to leave for day (3)

Ross

I believe the answer is:

era

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'day' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for era that I've seen before include "Period of alteration" , "Important historical period" , "Eon" , "Series of years" , "generation, maybe" .)

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