Advent, coming (7)
I believe the answer is:
arrival
This clue is a double definition.
'advent' is the first definition.
(I know that advent can be written as arrival)
'coming' is the second definition.
(I know that coming can be written as arrival)
(Other definitions for arrival that I've seen before include "coming on the scene" , "Act of coming" , "Appearance (at a destination)" , "Appearance, entrance" , "Appearance (at a place)" .)