Narcotic drug extracted from the unripe seed capsules of a poppy (5)

I believe the answer is:

opium

(Other definitions for opium that I've seen before include "De Quincey confessed to eating it" , "Addictive drug made from poppies" , "Poppy drug" , "Narcotic derived from poppies" , "Narcotic drug" .)

I've seen this clue in The Independent.

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