Crossword Genius

Ripple taking marrow from small bone (4,2)

Ross

I believe the answer is:

stir up

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'ripple' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

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(Other definitions for stir up that I've seen before include "Instigate" , "Incite; mix" , "Fire in" , "Foment (trouble)" , "Cause or provoke trouble" .)

I've seen this clue in the Sydney Morning Herald.
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