The most common and most likely answer to this crossword clue is the 10 letter word BRIGADIERS
I've seen this crossword clue in The Daily Telegraph
B
R
I
G
A
D
I
E
R
S
More clues leading to the result BRIGADIERS
Buddy explains!

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
BRIGADIERS noun- An army rank; an officer commanding a brigade.
- The highest field officer grade, below general officers, NATO grade O7