"For what reason?" (3)

I think it could be either:

Which length description are you looking for?:

3,4

why

'for what reason?' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for why that I've seen before include "How come?" , "Question" , "For what reason?" .)

I've seen this clue in The New York Times, The Times, The Telegraph, The Irish Times and the USA Today.

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