The most common and most likely answer to this crossword clue is the 6 letter word SYDNEY
I've seen this crossword clue in Financial Times
S
Y
D
N
E
Y
More clues leading to the result SYDNEY
- Primarily, somewhere you don’t necessarily expect Yukonese?
- City couples, happily married, on the telly at last
- Olympic venue to be completed within two years, son recalled
- Limits to security dishearten every Australian city
- A man’s calling for Australian port
- Vicious, fully vocal Commonwealth city
- State capital‘s second terminus erected within a couple of years
- Carton, possibly, to finish back behind yard in Seychelles
- Man that’s found in New South Wales
- First name for Australian port
Buddy explains!

The straight part
We know that "Olympic venue" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case olympic venue = sydney.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.