Musical composition, revolutionary concept Eno notably has penned (5)

I believe the answer is:

nonet

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'musical composition' is the definition.
(I've seen this in another clue)

'revolutionary concept eno notably has penned' is the wordplay.
'NONET' is hidden back-to-front in amongst the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for nonet that I've seen before include "Band of nine?" , "group composition" , "Piece of music for nine" , "Piece for nine payers" , "Composition for nine performers" .)

I've seen this clue in The Telegraph.

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