Dissuade, frighten off (5)
I believe the answer is:
deter
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">dissuade</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that dissuade can be written as deter)</span><br/ ><br/ >'<span class="explanation-format__original">frighten off</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for deter that I've seen before include "Warn off" , "Prevent by instilling fear" , "'Discourage, dissuade (5)'" , "Try to prevent" , "Discourage (someone from an action)" .)