Liquefied (6)
I believe the answer is:
molten
'liquefied' is the definition.
(I know that liquefied can be written as molten)
This is the entire clue.
(Other definitions for molten that I've seen before include "hot but ready to pour" , "Liquid (of metal)" , "State of moving lava" , "Liquefied by heat" , "Reduced to liquid form by heating" .)