Crossword Genius

Clarinet composition left out? Sure! (7)

Ross

I believe the answer is:

certain

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'sure' is the definition.
(I know that sure can be written as certain)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for certain that I've seen before include "Assured" , "Decided" , "Quite sure, positive" , "Proved beyond doubt" , "Sure; specific" .)

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