Crossword Genius

In sound flood rescue vessel reveals bow (3)

Ross

I believe the answer is:

arc

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'bow' is the definition.
(both can mean a curve)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for arc that I've seen before include "Curve of car" , "Bend" , "Part of curved line" , "Curvature" , "circle? Not entirely" .)

I've seen this clue in The Telegraph and The Times.
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