Even slightly (2,3)

I think it could be either:

Which length description are you looking for?:

2,3

at all

'even slightly' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for at all that I've seen before include "in any circumstances" , "Whatsoever" , "in any way" .)

I've seen this clue in the USA Today, The New York Times, The Washington Post and the L.A. Times Daily.

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