The most common and most likely answer to this crossword clue is the 10 letter word LANDOWNERS
I've seen this crossword clue in The Guardian
L
A
N
D
O
W
N
E
R
S
Buddy explains!

The straight part
We know that "lairds?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lairds? = landowners.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 LANDOWNERS mean?
LANDOWNERS noun- A person who owns land.