Do they figure in remedies for being too bony? (6)

I believe the answer is:

curves

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'do they' is the definition.
The definition suggests a plural noun which matches the answer.

I cannot understand how the rest of the clue works.

(Other definitions for curves that I've seen before include "They're not straight" , "Bends" , "Arcs, bows" , "Swerves, arches" .)

I've seen this clue in the Evening Standard.

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