Crossword Genius

Plant structure that shares its name with a letter used in Old English (5)

Ross

I believe the answer is:

thorn

(Other definitions for thorn that I've seen before include "Spine - prickle - Old English runic letter" , "irritation when in one's side" , "sharp object" , "Sharp spike on a plant" , "Sharp point on a shrub" .)

I've seen this clue in The Times.
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