Look what verse should do (4)

I believe the answer is:

scan

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

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

I cannot understand how the remainder of the clue works.

(Other definitions for scan that I've seen before include "View quickly" , "Examine quickly" , "Skim; examine" , "MRI or CAT say" , "Look over (in order to copy?)" .)

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

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