Crossword Genius

Key opening occasion (5)

Ross

I believe the answer is:

event

'occasion' is the definition.
(I've seen this before)

'key opening' is the wordplay.
'key' becomes 'e' (musical key).
'opening' becomes 'vent' (vent is a kind of opening).
'e'+'vent'='EVENT'

(Other definitions for event that I've seen before include "Affair" , "tournament" , "Occurence, occasion" , "case" , "important" .)

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