Tungsten (7)
I believe the answer is:
wolfram
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tungsten</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for wolfram that I've seen before include "at no 74, originally" , "Tungsten" , "hard stuff" , "elemental" , "greyish-white metal" .)