The most common and most likely answer to this crossword clue is the 6 letter word RENTED
R
E
N
T
E
D
Buddy explains!

The straight part
We know that "Leased" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case leased = rented.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 RENTED mean?
RENTED verb- To occupy premises in exchange for rent.
- To grant occupation in return for rent.
- To obtain or have temporary possession of an object (e.g. a movie) in exchange for money.
- To be leased or let for rent.