The most common and most likely answer to this crossword clue is the 6 letter word DUMDUM
I've seen this crossword clue in Financial Times
D
U
M
D
U
M
More clues leading to the result DUMDUM
Buddy explains!
The straight part
We know that "a possible feature of war" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a possible feature of war = dumdum.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 DUMDUM mean?
DUMDUM noun- A soft-nosed bullet that expands on impact to cause a gaping wound.
- An ignorant person; an idiot.