Crossword Genius

Bosom hoisted by parting of the ways (4-2)

Ross

I believe the answer is:

bust-up

I'm a little stuck... Click here to teach me more about this clue!

'parting of the ways' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'bosom hoisted' is the wordplay.
'bosom' becomes 'bust' (I've seen this before).
'hoisted' becomes 'up' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'bust'+'up'='BUST-UP'

'by' is the link.

Can you help me to learn more?

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

I've seen this clue in the Sydney Morning Herald.
Want a hint initially instead of a full solution? Install my app