Alloy of tin and lead (6)
I believe the answer is:
pewter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">alloy of tin and lead</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 pewter that I've seen before include "Tin alloy for utensils" , "Grey alloy of tin and lead, often in mug" , "Tin alloy used to make plates and mugs" , "Grey alloy of tin and lead, makes mugs etc." , "Bluish-grey alloy" .)