The most common and most likely answer to this crossword clue is the 10 letter word STRATIFIED
I've seen this crossword clue in The Sunday Telegraph
S
T
R
A
T
I
F
I
E
D
Buddy explains!
The straight part
We know that "arranged in layers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case arranged in layers = stratified.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 STRATIFIED mean?
STRATIFIED adjective- Arranged in a sequence of layers or strata
- (of society) having a class structure