Crossword Genius

Rossini composed, cutting son playing organ part (4)

Ross

I believe the answer is:

iris

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'part' is the definition.
(iris is a kind of part)

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

Can you help me to learn more?

(Other definitions for iris that I've seen before include "Pupil's place?" , "Murdoch in writing" , "pupil's governor" , "Nice flower or eye part" , "Lily" .)

I've seen this clue in The Telegraph.
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