The most common and most likely answer to this crossword clue is the 14 letter word BATTLE-SCARRED
I've seen this crossword clue in The Guardian
B
A
T
T
L
E
-
S
C
A
R
R
E
D
Buddy explains!
The straight part
We know that "Showing signs of fight" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case showing signs of fight = battle-scarred.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 BATTLE-SCARRED mean?
BATTLE-SCARRED adjective- Having scars or other damage received in battle