Crossword Genius

Main event? (7)


I believe the answer is:


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This clue could be a double definition.

'main' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'event?' is the second definition.
(regatta is a kind of event)

Can you help me to learn more?

(Other definitions for regatta that I've seen before include "Boating event" , "Series of boat races" , "Boat race-meeting" , "E.g. Henley" , "Sporting event with boat or yacht races" .)

I've seen this clue in The Telegraph.
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