Penny-dropping sound?

This crossword clue is for the definition: Penny-dropping sound?.
it’s A 21 letters crossword puzzle definition.
Next time, when searching for online help with your puzzle, try using the search term “Penny-dropping sound? crossword” or “Penny-dropping sound? crossword clue”. The possible answerss for Penny-dropping sound? are listed below.

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Possible Answers: AHA.

Last seen on: Daily Boston Globe Crossword Monday, 6 November 2023