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Muses, say, why tennis can't be played? (5)


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'muses say' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for nonet that I've seen before include "Tonne (anag.); music for a group" , "Piece for nine musicians" , "Composition for nine performers" , "musical piece" , "Band of nine?" .)

I've seen this clue in The Telegraph.
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