Blackberry plant (7)
I believe the answer is:
bramble
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">blackberry 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 bramble that I've seen before include "Wild thorny shrub" , "Gather fruit" , "Briar" , "Dog rose" , "Prickly hazard" .)