Vital organ (5)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vital organ</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 heart that I've seen before include "Not a club" , "Body organ" , "Earth (anag) -- compassion" , "Playing card - pity" , "See 22" .)
(Other definitions for liver that I've seen before include "Hepatic organ" , "Viler (anag.)" , "Glandular organ in the abdomen" , "Part of body" , "Bodily organ" .)