"Oh, I see it now!" (3)

I believe the answer is:

aha

(Other definitions for aha that I've seen before include "Triumphant cry" , "Surprised expression" , "Exclamation of triumph or surprise, a palindrome" , "it expresses surprise" , "Palindromic exclamation of triumph or surprise" .)

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

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