Poppy narcotic (5)
I believe the answer is:
opium
'poppy narcotic' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for opium that I've seen before include "powerful drug" , "Duller" , "Narcotic derived from poppies" , "The stuff of wars" , "Addictive drug made from poppies" .)