Crossword Genius

"Why, that's it!" (3)

Ross

I believe the answer is:

aha

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

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