Examine what poetry should do? (4)

I believe the answer is:

scan

I'm a little stuck... Click here to teach me more about this clue!

'examine' is the definition.
(I know that scan is a more specific form of examine)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for scan that I've seen before include "at one's feet?" , "Examine hastily" , "Examine carefully" , "Take a quick look" , "Examine, view" .)

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