Tall prickly plant (S, not Z) (6)

I believe the answer is:

teasel

(Other definitions for teasel that I've seen before include "Plant with prickly flower heads" , "Spiny flower head" , "Tall prickly plant" , "Prickly plant (S, not Z)" , "Plant with spiny purple flower heads" .)

I've seen this clue in The Times.

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