In error (2,7)

I think it could be either:

Which length description are you looking for?:

2,7

astray

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

This is all the clue.

(Other definitions for astray that I've seen before include "Wandering, errant" , "In a lost state" , "Off the correct path" , "(Gone) in wrong direction" , "in the wrong place" .)

I've seen this clue in the Evening Standard.

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