"Ah, gotcha" (4)

I think it could be either:

Which length description are you looking for?:

1,3 4*

I believe this clue is a double definition.

'ah' is the first definition.
(I've seen this in another clue)

'gotcha' is the second definition.
(I've seen this in another clue)

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

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