The most common and most likely answer to this crossword clue is the 10 letter word PROPERTIED
I've seen this crossword clue in The Times
P
R
O
P
E
R
T
I
E
D
Buddy explains!

The straight part
We know that "Landed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case landed = propertied.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 PROPERTIED mean?
PROPERTIED adjective- Owning property, especially land or real estate that yields an income.