Unwanted wild plant (4)
I believe the answer is:
weed
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unwanted wild plant</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for weed that I've seen before include "Work in garden" , "gone!" , "pot" , "Plant growing where it is not wanted" , "Ineffectual person" .)