Crossword Genius

High-ranking Mafioso has enemy leader polished off (4)

Ross

I believe the answer is:

done

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'polished off' is the definition.
(when one is 'polished off' they are done)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for done that I've seen before include "Managed" , "Performed" , "Robbed" , "Achieved" , "Thoroughly cooked; accomplished" .)

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