The most common and most likely answer to this crossword clue is the 9 plus 6 letter word HYDRAULIC BRAKES
I've seen this crossword clue in Independent
H
Y
D
R
A
U
L
I
C
B
R
A
K
E
S
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.