Inedible fungus (9)
I believe the answer is:
toadstool
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">inedible fungus</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 toadstool that I've seen before include "Capped fungus" , "Umbrella-shaped fungus" , "a potentially toxic development" , "Poisonous fungus" , "Common fungus" .)