Spiny succulents (5)
I believe the answer is:
cacti
'spiny succulents' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cacti that I've seen before include "Features of westerns" , "Spiny succulent plants" , "Plants of dry regions" , "Desert features" , "Spiky desert plants in plural" .)