501 finished (4)
I believe the answer is:
done
'finished' is the definition.
(similar in meaning)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for done that I've seen before include "Achieved" , "that may be said to seal a deal" , "Tricked" , "Robbed" , "Finished or ended" .)