Alchemist's offering (6)
I believe the answer is:
elixir
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">alchemist's offering</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for elixir that I've seen before include "Drink once supposed to prolong life indefinitely" , "Powerful potion" , "Magic cure-all" , "Alchemist's liquid" , "Magic drink believed to cure all ills" .)