The most common and most likely answer to this crossword clue is the 11 letter word SUMMERHOUSE
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Buddy explains!
The straight part
We know that "Belvedere" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case belvedere = summerhouse.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 SUMMERHOUSE mean?
SUMMERHOUSE noun- A house owned not as a primary residence and used as vacation home during warm weather months of the year.
- An outbuilding in a garden where the owners can relax in warm weather.