Crossword Genius

"That's it!” (3)

Ross

I think it could be either:

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3

6

(Other definitions for aha that I've seen before include "Exclamation of triumph or mockery, a palindrome" , "I've got it!" , "I'm surprised" , "Expression of surprise, satisfaction or triumph" , "Cry of triumph" .)

I've seen this clue in The New York Times, the King Feature Syndicate and the Universal.
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