Stinging plant (6)
I believe the answer is:
nettle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stinging 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 nettle that I've seen before include "Annoy; common weed" , "Stinging weed - pester" , "Common stinging plant" , "Sting or annoy with the plant" , "Wild plant - annoy" .)