Crossword Genius

"I've cracked it!" (3)

Ross

I believe the answer is:

aha

(Other definitions for aha that I've seen before include "Expression of surprise, satisfaction or triumph" , "Exclamation of discovery or triumph" , "I'm surprised" , "Triumphant cry" , "Exclamation of triumph or surprise, a palindrome" .)

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