Crossword Genius

"Knew it!" (3)

Ross

I believe the answer is:

aha

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

I've seen this clue in the USA Today.
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