Iron, say (5)
I believe the answer is:
metal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">iron say</span>' is the definition.<br/ ><span class="explanation-format__explanation">(iron is a kind of metal)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for metal that I've seen before include "Lead or iron, perhaps" , "Substance as gold, iron" , "Element such as iron, copper, zinc etc" , "Tin, for example" , "Aluminium or copper for instance" .)