Prickles (6)
I believe the answer is:
thorns
'prickles' is the definition.
('thorn' can be a synonym of 'prickle')
This is the entire clue.
(Other definitions for thorns that I've seen before include "Sharp projections on a stem" , "Vegetable spikes as on rose bush" , "Vegetable spikes on bushes" , "Sharp barbs as on roses" , "Sharp points on a plant" .)