Work trapeze artists are ill-advised to have? (5)

I believe the answer is:

nonet

'work' is the definition.
(musical work for nine musicians)

I cannot understand how the rest of the clue works.

(Other definitions for nonet that I've seen before include "group composition" , "Composition for nine performers" , "Musical composition -- tonne (anag)" , "Group of nine musicians" , "Composition for nine voices" .)

I've seen this clue in The Times.

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