Lord High Everything Else in the Gilbert and Sullivan operetta The Mikado (4,3)

I believe the answer is:

pooh bah

(Other definitions for pooh bah that I've seen before include "Role in The Mikado" , "Arrogant person of importance" , "pompous official" , "Lord High Everything Else (Mikado)" , "Self-important official" .)

I've seen this clue in The Mirror.

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