A stiff, sharp projection on a plant (5)

I believe the answer is:

thorn

(Other definitions for thorn that I've seen before include "Sharp point; runic character" , "Prickle on a plant" , "Sharp woody projection" , "eg Prickle on rose" , "Source of irritation" .)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.