The most common and most likely answer to this crossword clue is the 10 letter word TERMAGANTS
I've seen this crossword clue in The Daily Telegraph
T
E
R
M
A
G
A
N
T
S
Buddy explains!
The straight part
We know that "Brawlers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case brawlers = termagants.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 TERMAGANTS mean?
TERMAGANTS noun- A quarrelsome, scolding woman, especially one who is old and shrewish.
- A boisterous, brawling, turbulent person, whether male or female.