"That's a laugh!" (3)

I think it could be either:

Which length description are you looking for?:

hah

'that's a laugh' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Another definition for hah that I've seen is " Expression of surprise (one letter short of a laugh)".)

I've seen this clue in the USA Today.

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