Stop feeding wrong dose to fool (5)

I believe the answer is:

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'stop' is the definition.
(I know that close is a type of stop)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for close that I've seen before include "Shut - sultry" , "small quiet road" , "Meeting with a UFO?" , "Complete, a deal or case say" , "N ear; shut" .)

I've seen this clue in The Guardian.

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