"Now I understand!" (3)

I think it could be either:

Which length description are you looking for?:

2,3

aha

'now i understand' is the definition.

This is the entire clue.

(Other definitions for aha that I've seen before include "Surprised expression" , "Exclamation of discovery or triumph" , "Cry of triumph" , "Triumphant cry" , "Bingo" .)

I've seen this clue in the USA Today, the Universal and the Newsday.

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