The most common and most likely answer to this crossword clue is the 7 letter word TUSSLED
I've seen this crossword clue in The Daily Telegraph
T
U
S
S
L
E
D
More clues leading to the result TUSSLED
Buddy explains!

The straight part
We know that "Fought" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fought = tussled.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 TUSSLED mean?
TUSSLED verb- To have a tussle.