One of those leaning overboard? (5)

I believe the answer is:

davit

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'one' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

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

Can you help me to learn more?

(Other definitions for davit that I've seen before include "Lifeboat crane" , "nautical equipment" , "Crane-like device for suspending or lowering ship's boats" , "device for lowering boat" .)

I've seen this clue in the Evening Standard.

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