Self-righteous person (4)
I believe the answer is:
prig
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">self-righteous person</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 prig that I've seen before include "Self-righteous moralist" , "Old maid" , "Sanctimonious person" , "Unpleasant arrogant person" , "Straight-laced person" .)