Goody-goody (8)
I believe the answer is:
priggish
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">goody-goody</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 priggish that I've seen before include "Self-righteously moralistic" , "Self-righteous, toffee-nosed" , "Sanctimonious" , "Smugly narrow-minded" , "Exaggeratedly proper" .)