The most common and most likely answer to this crossword clue is the 6 plus 3 letter word TROJAN WAR
I've seen this crossword clue in Financial Times
T
R
O
J
A
N
W
A
R
More clues leading to the result TROJAN WAR
- Month in dispute — something black about that old conflict
- Long battle sailor has to keep girl in line
- Legendary conflict’s end in sight, first of twelve caught by arrow, unfortunately
- Conflict to recover old Jerusalem as initiated by Sadat
- Kind of warrant restraining Simpson in conflict
- Hacker’s tool, escalating bleak conflict
- Paris, say, not prepared to retreat in long-running conflict.
- M in argument during oil dispute of old
- Violent dispute at narrow junction’s beginning to get sorted
- Conflict leading to the fall of Paris
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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.