The most common and most likely answer to this crossword clue is the 7 letter word BUST-UP
B
U
S
T
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U
P
More clues leading to the result BUST-UP
- Result of donning Wonderbra? Ding-dong!
- Fight to get sheep onto public transport
- Assert loan must be raised, causing quarrel
- Locate stand-in turning up in row
- Row caused by an underwired bra?
- Quarrel where vehicle gets rammed?
- Bra-destroying feminist presumably wouldn’t have this quarrel!
- Fight at public transportation place’s counter
- Coach raising deposit results in a serious quarrel
- Quarrel and put sub in reverse
Buddy explains!

The straight part
We know that "quarrel" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case quarrel = bust-up.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 BUST-UP mean?
BUST-UP noun- An angry argument.