Musical comedy (8)

I believe the answer is:

operetta

'musical comedy' is the definition.
(thesaurus)

This is all the clue.

(Other definitions for operetta that I've seen before include "Eg, Die Fledermaus" , "Short amusing opera" , "Type of musical drama" , "Showboat or The Gondoliers, say" , "Short musical drama" .)

I've seen this clue in the Penny Press and The Star Tribune.

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