Periodic table entry (7)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">periodic table entry</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 element that I've seen before include "For example, gold" , "Earth, water, air or fire" , "Fundamental component" , "Component - factor" , "Chemical building block" .)