Crossword Genius

Had Adam a spare one? (3)

Ross

I believe the answer is:

rib

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'spare one?' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for rib that I've seen before include "Eve was known as Adam's ..." , "spare one?" , "Curved bone joined to the spine" , "Slender bone" , "that was sacrificed for wife originally" .)

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