Shock, dismay (5)
I believe the answer is:
appal
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">shock</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">dismay</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for appal that I've seen before include "Greatly dismay" , "Fill with horror" , "Cause to be unpleasantly surprised" , "Dismay, horrify" , "Petrify" .)