Machine shop alloy (6)
I believe the answer is:
solder
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">machine shop alloy</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 solder that I've seen before include "Melted alloy, used to join two metal surfaces" , "Alloy melted to join circuit components" , "Join or fuse metal, using an alloy" , "Fusible jointing alloy" , "Join two metals with a melted alloy" .)