Happens (6)
I believe the answer is:
occurs
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">happens</span>' is the definition.<br/ ><span class="explanation-format__explanation">('occur' can be a synonym of 'happen')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for occurs that I've seen before include "Crocus (anag)" , "Happens or comes to mind" , "Comes to pass" , "Happens, takes place" .)