The most common and most likely answer to this crossword clue is the 9 letter word ASTRODOME
I've seen this crossword clue in Independent
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More clues leading to the result ASTRODOME
- Sports ground: area certain people set foot inside
- Athlete initially stepped out to receive award in sports stadium
- A second book about staff in sporting venue
- Miss start of vast party in Rome’s all-weather venue
- Having stepped inside we left breathtaking sports venue
- Endless wine with party in Italian city stadium
- A street party in Rome’s park
Buddy explains!

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 ASTRODOME mean?
ASTRODOME noun- A transparent dome in the fuselage of an aircraft or spacecraft through which navigational observations may be made