Coming or approach (6)
I believe the answer is:
advent
I believe this clue is a double definition.
'coming' is the first definition.
(advent is the arrival or coming of something)
'approach' is the second definition.
(I've seen this before)
(Other definitions for advent that I've seen before include "appearance" , "Run-up to Christmas" , "Season for a candle?" , "when the Church year begins" , "sort of calendar" .)