Egg timer (6)

I believe the answer is:

easter

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'egg timer' is the definition.
Both the definition and answer are singular nouns.
Perhaps they are linked in a way I don't understand?

This is the entire clue.

Can you help me to learn more?

(Other definitions for easter that I've seen before include "Annual religious festival" , "Christian celebration for Teresa" , "Christian festival in Spring" , "Time to celebrate" , "Card, egg or Island" .)

I've seen this clue in the Evening Standard.

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