The most common and most likely answer to this crossword clue is the 8 letter word USUFRUCT
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The straight part
We know that "Y/the right to use another's property" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case y/the right to use another's property = usufruct.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 USUFRUCT mean?
USUFRUCT noun- The legal right to use and derive profit or benefit from property that belongs to another person, as long as the property is not damaged.
- To use and derive profit or benefit from property that belongs to another person.