Crossword Genius

Coming a day before opening (6)

Ross

I believe the answer is:

advent

'coming' is the definition.
('advent' can be a synonym of 'coming')

'a day before opening' is the wordplay.
'day' becomes 'd'.
'before' is a charade indicator (letters next to each other).
'opening' becomes 'vent' (vent is a kind of opening**).
'a'+'d'+'vent'='ADVENT'

(Other definitions for advent that I've seen before include "Arrival of important person or event" , "Coming, arrival" , "sort of calendar" , "when the Christmas shopping has to be done?" , "Christian season" .)

I've seen this clue in The Telegraph.
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