Gold bar (5)
I believe the answer is:
ingot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gold bar</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for ingot that I've seen before include "Bar of bullion, for example" , "Mass of unwrought gold, for instance" , "Block (of steel, gold, etc)" , "Mass of precious metal" , "Bar, brick of metal" .)