The term 'purify, in a way' can be solved by two crossword solutions: SMELT (5 letters) and sublimate (9 letters). Smelting is the process of heating a material to a high temperature in order to separate its components. This is often used to purify metals from their ore. Sublimation is the process of a solid material turning directly into a gas without passing through a liquid phase. This is often used to purify substances such as iodine or camphor.