Alloy containing tin (6)
I believe the answer is:
pewter
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">alloy containing tin</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 pewter that I've seen before include "Grey alloy of tin and lead, makes mugs etc." , "Beer-tankard alloy" , "Plate" , "Silver-grey alloy" , "Tin alloy used in tankards, etc" .)