Crossword Genius

Cut up diamonds with an adherent of Daesh? (9)

Ross

I believe the answer is:

dismember

'cut up' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for dismember that I've seen before include "Separate limbs from the body" , "Cut the limbs from" , "Divide up (organisation)" , "Break up" , "Tear limb from limb" .)

I've seen this clue in The Guardian.
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