Crossword Genius

Noah's response when he heard the rain (3)

Ross

I believe the answer is:

ark

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'noah's response when he heard the rain' is the definition.
Although both the answer and definition are singular nouns, I cannot understand 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 "Noah's boat" , "Ship built by Noah" , "Large vessel" , "protection for couples that rose in bad weather" , "State" .)

I've seen this clue in the Evening Standard.
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