The most common and most likely answer to this crossword clue is the 8 letter word RUNAGATE
I've seen this crossword clue in The Guardian
R
U
N
A
G
A
T
E
More clues leading to the result RUNAGATE
Buddy explains!

The straight part
We know that "Fugitive/Fugitive" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fugitive/fugitive = runagate.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 RUNAGATE mean?
RUNAGATE noun- A deserter, renegade or apostate.
- A fugitive; a runaway.