Brass component (4)
I believe the answer is:
zinc
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">brass component</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 zinc that I've seen before include "Antioxidant element" , "Galvanizing metal" , "Sivery-white metal" , "Metal alloyed with copper to make brass" , "Ingredient in brass" .)