Sharp points on a plant (6)
I believe the answer is:
thorns
'sharp points on a plant' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for thorns that I've seen before include "Sharp-pointed tips on stems" , "Sharp barbs as on roses" , "Vegetable spikes as on rose bush" , "Sharp tips on a stem" , "Vegetable spikes on bushes" .)