Norma maybe is not entirely cooperative (5)

I believe the answer is:

opera

'norma' is the definition.
(opera by Vincenzo Bellini)

'is not entirely cooperative' is the wordplay.
'is not entirely' indicates a hidden word.
'OPERA' is hidden within 'cooperative'.

'maybe' is the link.

(Other definitions for opera that I've seen before include "Don Giovanni, for instance" , "Carmen, for example" , "could be soap" , "Eg, Il trovatore" , "La Scala production, perhaps" .)

I've seen this clue in The Times.

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