Legitimacy (12)
I believe the answer is:
authenticity
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">legitimacy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for authenticity that I've seen before include "Genuine quality" , "Genuineness" .)