She anticipates the day (3)

I believe the answer is:

eve

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'the day' is the definition.
(eve is a kind of day)

I cannot understand how the remainder of the clue works.

(Other definitions for eve that I've seen before include "Night before an event" , "One from Genesis" , "First lady from the night before" , "Lady of the previous night" , "See 27" .)

I've seen this clue in the Evening Standard.

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