Fused (6)
I believe the answer is:
molten
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fused</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for molten that I've seen before include "Liquefied by heat" , "Reduced to liquid form by heating" , "State of moving lava" , "Liquid (of metal)" , "hot but ready to pour" .)