Spiny desert plant (6)
I believe the answer is:
cactus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spiny desert plant</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cactus that I've seen before include "Spiney plant of dry regions" , "plant, succulent one" , "Spiny plant of dry regions" , "Succulent desert plant" , "Plant found in dry places" .)