Not this one (7)
I believe the answer is:
another
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not this one</span>' is the definition.<br/ ><span class="explanation-format__explanation">(not this one, ie another one)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for another that I've seen before include "encore?" , "A different (thing)" , "Additional: alternative" , "Additional, one more" , "A different one" .)