Crossword Genius

The day before a girl is found (3)

Ross

I believe the answer is:

eve

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'the day before' is the definition.
(eve is the night before something)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for eve that I've seen before include "See 27" , "Previous day" , "Brink" , "Girl" , "Day before; girl's name" .)

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