Advent (6)
I believe the answer is:
coming
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">advent</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that advent can be written as coming)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for coming that I've seen before include "When adulthood begins" , "Arrival - future" , "assured of future success" , "Advent" , "Developing; arriving" .)