Crossword Genius

Fight at public transportation place’s counter (4-2)

Ross

I believe the answer is:

bust-up

But I can't explain it at all!

(Other definitions for bust-up that I've seen before include "Serious quarrel or fight (B, not D)" , "Serious quarrel/fight" , "Quarrel, possibly ending a friendship" , "Argument finishing a relationship" , "disagreement" .)

I've seen this clue in The Hindu.
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