Andean shrub (4)
I believe the answer is:
coca
'andean shrub' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for coca that I've seen before include "S. American drug crop" , "Drug-producing plant" , "Shrub whose leaves are chewed in the Andes as a stimulant" , "Leaves for snow" , "Drug-yielding shrub" .)