The --, Gilbert and Sullivan opera (6)

I believe the answer is:

mikado

'the gilbert and sullivan opera' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for mikado that I've seen before include "Japanese ruler" , "one of 63 [OPERETTAS]" , "Japanese emperor, operetta and delicious biscuit" , "Gilbert and Sullivan opera" , "Gilbert and Sullivan's emperor" .)

I've seen this clue in The Telegraph.

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