"Would you look at that!" (3)

I think it could be either:

Which length description are you looking for?:

aha

(Other definitions for aha that I've seen before include "Cry of surprise" , "Exclamation of triumph or surprise, a palindrome" , "Surprised expression" , "Bingo" , "Expression of surprise, satisfaction or triumph" .)

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

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