Magic potion (6)
I believe the answer is:
elixir
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">magic potion</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 elixir that I've seen before include "Magical or medicinal potion" , "Something believed to cure all ills" , "Philosopher's stone" , "wonder drug" , "The drink that gives eternal life" .)