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Muse having to leave for day (3)


I believe the answer is:


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'for day' is the definition.
(day can mean an era of time)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for era that I've seen before include "Specific time" , "Important date" , "Important historical period" , "Eon" , "Are involved in time span" .)

I've seen this clue in The Times.
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