Piece of Bellini, Mendelssohn or Massenet screened (5)

I believe the answer is:

norma

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'piece of bellini' is the definition.
(opera by Vincenzo Bellini)

'mendelssohn or massenet screened' is the wordplay.
'NORMA' is hidden within the letters.
However, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for norma that I've seen before include "Game; shared supply" , "Operatic work" , "Girl" , "Bellini heroine" , "She incited Gauls v. Romans (Bellini)" .)

I've seen this clue in The Independent.

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