Completed 501 (4)

I believe the answer is:

done

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'completed' is the definition.
(something that's been completed has been done)

I don't understand how the rest of the clue works.

(Other definitions for done that I've seen before include "Completed" , "This settled" , "Cooked; carried out" , "Achieved" , "Performed" .)

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

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