Silly to repeat work by Gilbert and Sullivan? (8)

I believe the answer is:

operetta

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'work by gilbert and sullivan?' is the definition.
I can't tell whether this defines the answer.

'silly to repeat' is the wordplay.
'silly' indicates anagramming the letters.
'to'+'repeat'='torepeat'
'torepeat' anagrammed gives 'OPERETTA'.

Can you help me to learn more?

(Other definitions for operetta that I've seen before include "Eg, The Gondoliers" , "Type of musical drama" , "Singing" , "La belle Helene, say" , "Light musical stage work" .)

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