What Noah said when he heard the rain (3)

I believe the answer is:

ark

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'what noah said when he heard the rain' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

This is the entire clue.

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(Other definitions for ark that I've seen before include "Flood vessel; box (arch.)" , "Great biblical boat" , "Animal rescue transport" , "Noah's craft" , "Rescue vessel" .)

I've seen this clue in the Evening Standard.

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