Pupil-dilating alkaloid (8)

I believe the answer is:

atropine

(Other definitions for atropine that I've seen before include "Poison found in deadly nightshade used as a drug" , "A pointer (anag) - belladonna" , "Drug obtained from deadly nightshade" , "Poisonous substance" .)

I've seen this clue in the King Feature Syndicate.

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