Goof

I think it could be either:

Which length description are you looking for?:

err

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

This is all the clue.

(Other definitions for err that I've seen before include "Make a wrong move" , "Leave the straight and narrow" , "Go wrong" , "Drop a clanger" , "Bungle" .)

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

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