Holier-than-thou (13)
I believe the answer is:
sanctimonious
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">holier-than-thou</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sanctimonious that I've seen before include "with a holier-than-thou attitude" , "Ostentatiously pious" , "Making show of being morally superior" , "Self-righteous" , "Canting" .)