Hallucinogenic fungus (5,8)
I believe the answer is:
magic mushroom
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hallucinogenic 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 magic mushroom that I've seen before include "Woodland hallucinogen" , "Fungus containing a hallucinogenic substance" , "Fungus causing hallucinations" , "Hallucinatory item" , "Fungus with hallucinogenic properties" .)