A fruit that changes overnight (4)

I believe the answer is:

date

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'a fruit' is the definition.
(I know that date is a type of edible fruit)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for date that I've seen before include "Particular time of event - fruit" , "See 12" , "Specified day" , "Year or day when an event occurred" , "Tropical fruit" .)

I've seen this clue in The Globe and Mail.

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