The most common and most likely answer to this crossword clue is the 10 letter word PLASTERERS
I've seen this crossword clue in The Guardian
P
L
A
S
T
E
R
E
R
S
Buddy explains!
The straight part
We know that "They leave their coats on the wall /They leave their coats on the wall" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they leave their coats on the wall /they leave their coats on the wall = plasterers.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 PLASTERERS mean?
PLASTERERS noun- A person whose occupation is to plaster walls.
- One who makes plaster casts.