"Now I've got it!" (3)

I believe the answer is:

aha

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

I've seen this clue in the LA Times.

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