Crossword Genius

Left, having finished really early (4)

Ross

I believe the answer is:

quit

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'left' is the definition.
(I've seen this in other clues)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for quit that I've seen before include "Leave, depart" , "Desist" , "Leave or abandon" , "Abandon, depart" , "Leave - resign" .)

I've seen this clue in The Telegraph.
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