Tincture of opium — maul UN ad (anag) (8)

I believe the answer is:

laudanum

(Other definitions for laudanum that I've seen before include "Coleridge took this" , "Opium-based drug" , "Opiate popular in Victorian times" , "Tincture of opium" , "Narcotic of choice in old novels" .)

I've seen this clue in The Guardian.

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