Crossword Genius

Bone going spare? (3)


I believe the answer is:


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This might be a double definition.

'bone' is the first definition.
(rib is a type of bone)

'going spare?' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
I also know that 'spare' relates to this answer.

Can you help me to learn more?

(Other definitions for rib that I've seen before include "spare one?" , "Poke fun at the bone" , "Hinged rod in umbrella" , "structural member" , "Vein structure in a leaf" .)

I've seen this clue in The Mirror.
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