The most common and most likely answer to this crossword clue is the 10 letter word SQUABBLING
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More clues leading to the result SQUABBLING
Buddy explains!

The straight part
We know that "argumentative" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case argumentative = squabbling.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 SQUABBLING mean?
SQUABBLING verb- To participate in a minor fight or argument.
- To disarrange, so that the letters or lines stand awry and require readjustment.
- A petty argument or conflict.