Crossword Genius

"The penny drops!" (3)

Ross

I believe the answer is:

aha

(Other definitions for aha that I've seen before include "Palindromic exclamation of triumph or surprise" , "Exclamation of discovery or triumph" , "I get it!" , "Expression of surprise, satisfaction or triumph" , "Bingo" .)

I've seen this clue in the LA Times.
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