Cousin of poison ivy (5)
I believe the answer is:
sumac
'cousin of poison ivy' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sumac that I've seen before include "Shrub colourful in Autumn" , "Spice" , "Novelist" , "Rhus tree" , "Smoke-bush" .)