Crossword Genius

First couple retreated in bloodiest bust (6)

Ross

I believe the answer is:

arrest

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'bust' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for arrest that I've seen before include "Stop (on suspicion)" , "Seize (a crime suspect)" , "Land next to the sea" , "Bring to a standstill" , "Detain under suspicion of criminal behaviour" .)

I've seen this clue in the Sydney Morning Herald.
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