The —, 1885 operetta by Gilbert and Sullivan (6)

I believe the answer is:

mikado

(Other definitions for mikado that I've seen before include "mperor" , "Japanese emperor as in G & S operetta" , "Japanese emperor, operetta and delicious biscuit" , "one of 63 [OPERETTAS]" , "Gilbert and Sullivan's emperor" .)

I've seen this clue in The Mirror.

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