Metal cast as a block (5)
I believe the answer is:
ingot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">metal cast as a block</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ingot that I've seen before include "Brick-shaped lump of cast metal" , "Piece of precious metal" , "A brick shaped lump of gold" , "A lump of metal like gold" , "Bar of bullion, for example" .)