Crossword Genius

"I'm such an idiot!” (3)

Ross

I believe the answer is:

doh

(Other definitions for doh that I've seen before include "Homeric grunt of annoyance" , "The note C" , "First and eighth note in tonic sol-fa" , "It begins the tonic solfa" , "Stupid me!" .)

I've seen this clue in The Wall Street Journal.
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