Metal - US coin (6)
I believe the answer is:
nickel
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">metal</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(nickel is a kind of metal)</span><br/ ><br/ >'<span class="explanation-format__original">us coin</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(five cent coin in the US)</span><br/ ><br/ ></span>
(Other definitions for nickel that I've seen before include "Coin worth half a dime" , "Silvery-white metal" , "An American 5-cent coin" , "Silvery white metal" , "5c coin" .)