Event, happening (8)
I believe the answer is:
incident
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">event</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(incident is a kind of event)</span><br/ ><br/ >'<span class="explanation-format__original">happening</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(an incident is a happening or event)</span><br/ ><br/ ></span>
(Other definitions for incident that I've seen before include "Confrontation" , "Falling" , "Episode" , "Happening (often of a criminal nature)" , "is liable to occur" .)