Cry of insight (3)

I believe the answer is:

aha

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

I've seen this clue in the Universal, the LA Times, The Wall Street Journal and the King Feature Syndicate.

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