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A keyhole affair (5)

Ross

I believe the answer is:

event

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'a keyhole' is the first definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

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

Can you help me to learn more?

(Other definitions for event that I've seen before include "Occurence, occasion" , "Something happening" , "Planned public or social occasion" , "Occurence, happening" , "Result; incident" .)

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