Crossword Genius

Serious quarrel (4-2)

Ross

I believe the answer is:

bust-up

'serious quarrel' is the definition.
(I've seen this before)

This is all the clue.

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

I've seen this clue in The Times and The Guardian.
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