Stinging weed (6)
I believe the answer is:
nettle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stinging weed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for nettle that I've seen before include "Annoy - stinger" , "Annoy; common weed" , "Irritate, annoy" , "Upset" , "Stinging plant; annoy" .)