Veracity (5)
I believe the answer is:
truth
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">veracity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for truth that I've seen before include "Actuality" , "Verified fact" , "Beauty is (said Keats)" , "Honesty" , "Verity" .)