Crossword Genius

A stiff, sharp projection on a plant (5)

Ross

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.
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