The most common and most likely answer to this crossword clue is the 8 letter word OLYMPIAD
I've seen this crossword clue in The Times
O
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Buddy explains!
The straight part
We know that "sporting event" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sporting event = olympiad.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does OLYMPIAD mean?
OLYMPIAD noun- A period of four years, by which the ancient Greeks reckoned time, being the interval from one celebration of the Olympic games to another, beginning with the victory of Corbus in the foot race, which took place in the year 776 BC; as, the era of the olympiads.
- An occurrence of the Olympic games.
- A competition or series of competitions resembling an Olympiad, especially in science.