Toxic substance (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">toxic substance</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 ricin that I've seen before include "Highly toxic plant protein" , "Poison from castor oil seeds" , "Highly-toxic poison" , "poisonous substance" , "castor-oil product" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">toxic substance</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 poison that I've seen before include "If taken, it can harm or kill" , "Meat for someone else" , "[ADDER] 's defence" , "I spoon up the lethal substance" , "It causes illness or death in a living organism" .)