Crossword Genius

Stiffeners to spare? (4)

Ross

I believe the answer is:

ribs

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'stiffeners' is the definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

I don't understand the remainder of the clue.

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(Other definitions for ribs that I've seen before include "Teases (informal)" , "Makes fun of - bones" , "Chest bones, tasty when spare" , "Arched bones extending from the spine" , "Curved bones around the chest" .)

I've seen this clue in the Evening Standard.
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