"Boy king" whose tomb was discovered in 1922, familiarly (3)

I believe the answer is:

tut

(Other definitions for tut that I've seen before include "Expression of disapproval, usually doubled" , "Sound disapproving" , "Noise of disapproval" , "Disapproving noise" , "Show disapproval" .)

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

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