"What fun!" (4)

I think it could be either:

Which length description are you looking for?:

whee

'what fun' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for whee that I've seen before include "Expression of delight" , "Cry from someone going downhill fast?" , "Exclamation of excitement when going fast" , "What fun" , "Exuberant cry" .)

I've seen this clue in the Newsday and The New York Times.

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