"Iolanthe" and "Candide," for two (9)

I believe the answer is:

operettas

(Other definitions for operettas that I've seen before include "10d [IOLANTHE], 45d [RUDDIGORE] and 6a [PRINCESS IDA], say" , "Light musicals for poetaster" , "Performances" , "Musical compositions as by Gilbert & Sullivan" .)

I've seen this clue in The New York Times.

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