Crossword Genius

Cold, bare chest (3)

Ross

I believe the answer is:

ark

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'chest' is the definition.
(historical term for a chest)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ark that I've seen before include "Rescue ship" , "Boat built to withstand floods" , "Noah's boat" , "Large vessel" , "Noah's craft" .)

I've seen this clue in The Independent.
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