Norma is not such easy work (5,5)

I believe the answer is:

light opera

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'norma is not' is the definition.
I can't tell whether this definition defines the answer.

'easy work' is the wordplay.
'easy' becomes 'light' (similar in meaning).
'work' becomes 'opera' (musical work).
'light'+'opera'='LIGHT OPERA'

'such' acts as a link.

Can you help me to learn more?

(Other definitions for light opera that I've seen before include "musical entertainment" , "'The Mikado', e.g." .)

I've seen this clue in The Irish Times.

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