Narcotic derived from poppies (5)
I believe the answer is:
opium
'narcotic derived from poppies' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for opium that I've seen before include "De Quincey confessed to eating it" , "Addictive drug made from poppies" , "Dried juice of white poppy" , "The stuff of wars" , "Narcotic derived from poppy" .)