Crossword Genius

Sound of enlightenment (3)

Ross

I believe the answer is:

aha

(Other definitions for aha that I've seen before include "I see!" , "Palindromic exclamation of triumph or surprise" , "Exclamation of discovery or triumph" , "Exclamation of triumph or surprise, a palindrome" , "Triumphant cry" .)

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