Combination (7)
I believe the answer is:
amalgam
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">combination</span>' is the definition.<br/ ><span class="explanation-format__explanation">(amalgam is a kind of combination)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for amalgam that I've seen before include "often filling" , "Mixture - alloy of mercury" , "Mixture of metals" , "Alloy of mercury and another metal" , "Blend of metals" .)