Of the 'soap' variety, about royalty? (6)

I believe the answer is:

operas

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

'soap variety about royalty?' is the wordplay.
'variety' indicates an anagram.
'about' indicates putting letters inside.
'royalty?' becomes 'ER' (abbreviation for Elizabeth Regina).
'soap' with letters rearranged gives 'opas'.
'opas' going around 'er' is 'OPERAS'.

Can you help me to learn more?

(Other definitions for operas that I've seen before include "These shows are a poser, oddly" , "The Magic Flute, Don Giovanni etc" , "Dramatic works set to music" , "La Traviata, Aida" , "Musical dramas" .)

I've seen this clue in the Evening Standard.

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