Result of wearing bra creates a row (4-2)

I believe the answer is:

bust-up

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'a row' is the definition.
(bust-up is a kind of row)

I don't understand the remainder of the clue.

(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" , "disagreement" , "Argument finishing a relationship" .)

I've seen this clue in The Guardian.

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