The most common and most likely answer to this crossword clue is the 8 letter word FIGHTERS
I've seen this crossword clue in The Guardian
F
I
G
H
T
E
R
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.
What does FIGHTERS mean?
FIGHTERS noun- A person who fights; a combatant.
- A warrior; fighting soldier.
- A pugnacious, competitive person.
- (eulogistic) A person with a strong determination to resist protracted or severe adversity, especially illness.
- A class of fixed-wing aircraft whose primary purpose is that of shooting down other aircraft. Some of these (Fighter-Attack or Attack aircraft) also have a secondary purpose of attacking ground targets.
- A boxer or participant in any martial art.
- A firefighter
- A game with a focus on physical combat.