Old name for an emperor of Japan (6)

I believe the answer is:

mikado

(Other definitions for mikado that I've seen before include "Gilbert and Sullivan's emperor" , "Japanese 2" , "Gilbert and Sullivan opera" , "G & S' alternative for "The Town of Titipu"" , "one of 63 [OPERETTAS]" .)

I've seen this clue in The Times and The Sunday Times.

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