One may get one's hooks into them (4)

I believe the answer is:

eyes

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'one' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

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

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(Other definitions for eyes that I've seen before include "Looks at carefully" , "Poetically, they're the windows of the soul" , "Closely looks at" , "Narrowly observes" , "Ogles" .)

I've seen this clue in The Irish News and The Globe and Mail.

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