A coming occasion in the church calendar (6)

I believe the answer is:

advent

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'a coming' is the definition.
(advent is the arrival or coming of something)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for advent that I've seen before include "Forty days preceding Christmas" , "Christmas shopping time in" , "The season leading up to Christmas" , "sort of calendar" , "Arrival of important person or event" .)

I've seen this clue in The Globe and Mail.

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