Quotation mark (8,5)
I believe the answer is:
inverted comma
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">quotation mark</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for inverted comma that I've seen before include "In writing, it may open up a quotation" , "Single quote mark" , "Quotation mark" , "Punctuation mark (one of a pair)" , "Singular quote" .)