Luigi , Italian composer of 1961 work Intolleranza 1960 (4)

I believe the answer is:

nono

(Other definitions for nono that I've seen before include "Impossibility" , "Something totally unacceptable (informal)" , "Non-starter (colloq.)" , "Something that would be totally unacceptable" , "Something not acceptaable" .)

I've seen this clue in The Mirror.

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