As soon as seen (2,5)

I think it could be either:

Which length description are you looking for?:

2,5

on sight

'as soon as seen' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for on sight that I've seen before include "How to shoot dangerous criminal" , "when observed" , "As soon as seen" , "without a second glance?" , "How good musicians can play" .)

I've seen this clue in The Mirror.

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