Poppy product (5)
I believe the answer is:
opium
'poppy product' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for opium that I've seen before include "Poppy drug" , "Derivative of Poppy" , "Number" , "Narcotic derived from poppy" , "Addictive drug made from poppies" .)