Metal for a blacksmith (4)
I believe the answer is:
iron
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">metal for a blacksmith</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for iron that I've seen before include "Smooth things" , "Very robust" , "Hard metal" , "Heavy metal that rusts easily" , "Remove creases from" .)