The most common and most likely answer to this crossword clue is the 8 letter word POLEMICS
P
O
L
E
M
I
C
S
More clues leading to the result POLEMICS
Buddy explains!

The straight part
We know that "Arguing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case arguing = polemics.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 POLEMICS mean?
POLEMICS noun- A person who writes in support of one opinion, doctrine, or system, in opposition to another; one skilled in polemics; a controversialist; a disputant.
- An argument or controversy.
- A strong verbal or written attack on someone or something.
- The art or practice of making arguments or controversies.
- The refutation of errors in theological doctrine.