Metal brick (5)
I believe the answer is:
ingot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">metal brick</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ingot that I've seen before include "Seize quickly; steal" , "expensive block" , "Mass of metal, especially gold or silver" , "Mass of precious metal" , "Piece of precious metal" .)