Happenstance (6)
I believe the answer is:
chance
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">happenstance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for chance that I've seen before include "Run a risk" , "The way things happen, luck" , "he unpredictable element of life" , "Likelihood" , "Happen - fortuitous" .)