The most common and most likely answer to this crossword clue is the 12 letter word COMPARTMENTS
I've seen this crossword clue in The Daily Telegraph
C
O
M
P
A
R
T
M
E
N
T
S
Buddy explains!

The straight part
We know that "divisions" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case divisions = compartments.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.
Crossword Answer definitions
COMPARTMENTS noun- A room, or section, or chamber
- One of the parts into which an area is subdivided.
- Part of a protein that serves a specific function.
- A mound (often of grass) beneath the shield in a coat of arms on which the supporters stand.
- A region in the body, delimited by a biological membrane.