The most common and most likely answer to this crossword clue is the 9 letter word BREATHERS
I've seen this crossword clue in The Guardian
B
R
E
A
T
H
E
R
S
More clues leading to the result BREATHERS
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.
What does BREATHERS mean?
BREATHERS noun- Something or someone that breathes.
- A short break; a rest or respite.
- A spatially localized, time-periodic excitation in a one-dimensional lattice.
- That which puts one out of breath, such as violent exercise.
- An air inlet path to the crankcase