A few mentioned pinching diver's bone (7)

I believe the answer is:

sternum

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'bone' is the definition.
(sternum is a kind of bone)

I cannot understand how the rest of the clue works.

(Other definitions for sternum that I've seen before include "somewhere in chest" , "Chest bone" , "Human bone -- ten rums (anag)" , "Breastbone" , "Munster (anag.)" .)

I've seen this clue in The Times.

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