Like the Cyclops, singularly (4)

I believe the answer is:

eyed

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'like' is the definition.
Both the definition and answer are adjectives. Maybe you can see an association between them that I can't see?

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for eyed that I've seen before include "Vegetable" , "Looked at, warily perhaps" , "Spotted" , "Ogled" , "Viewed" .)

I've seen this clue in the Evening Standard.

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