Biblical flood shelter (3)

I believe the answer is:

ark

'biblical flood shelter' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ark that I've seen before include "Boat built to withstand floods" , "Noah's craft" , "Noah's boat" , "Coffer" , "Great biblical boat" .)

I've seen this clue in the Universal and the USA Today.

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