Spiny plants (5)

I believe the answer is:

cacti

'spiny plants' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for cacti that I've seen before include "They're decidedly prickly" , "growing group" , "Prickly plants" , "Spiny desert plants" , "Plants of dry regions" .)

I've seen this clue in The Times, the King Feature Syndicate, The Star Tribune, the Penny Press, the USA Today and the Evening Standard.

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