Are such ribs extra? (5)

I believe the answer is:

spare

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'extra?' is the definition.
(both can mean left over)

I can't explain the rest of the clue.

(Other definitions for spare that I've seen before include "slit at top of trousers in Scotland" , "Additional - for use when needed" , "Pardon; unneeded" , "In reserve; pardon" , "Surplus to requirements" .)

I've seen this clue in the Evening Standard.

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