Crossword Genius

"I should've known!" (3)

Ross

I believe the answer is:

doh

(Other definitions for doh that I've seen before include "Homeric grunt of annoyance" , "Silly me!" , "It begins the tonic solfa" , "Homer Simpson's exasperated cry" , "First and eighth note in tonic sol-fa" .)

I've seen this clue in the Universal.
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