Crossword Genius

Brainwave's exultant sound? (3)

Ross

I believe the answer is:

aha

(Other definitions for aha that I've seen before include "Exclamation of discovery or triumph" , "I'm surprised" , "I see!" , "Cry of triumph" , "Exclamation of triumph or surprise, a palindrome" .)

I've seen this clue in the Sydney Morning Herald.
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