Watches carefully (4)

I think it could be either:

Which length description are you looking for?:

eyes

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

This is all the clue.

(Other definitions for eyes that I've seen before include "Witnesses" , "Poetically, they're the windows of the soul" , "Looks at carefully" , "Optical organs" , "Looks at - organs" .)

I've seen this clue in the Newsday and the Universal.

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