Crossword Genius

Empty bucket put with loos after an accident? (4,3)

Ross

I believe the answer is:

slop out

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'empty' is the definition.
Both the answer and definition are verbs in their base form.
Perhaps there's a link between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for slop out that I've seen is " Remove waste from prison cell".)

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