Crossword Genius

You can't play it when breathless (5)

Ross

I believe the answer is:

flute

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'you' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see an association between them that I don't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for flute that I've seen before include "Narrow wineglass" , "Blown" , "Champagne glass" , "Wine glass; instrument" , "High-pitched woodwind instrument" .)

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