Magical potion (6)
I believe the answer is:
elixir
'magical potion' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for elixir that I've seen before include "Liquid remedy believed to cure all ills" , "Medicinal liquid believed to cure all ills" , "Quintessence" , "wonder drug" , "Potion, panacea" .)