Crossword Genius

Spoil part of the Common Market (3)

Ross

I believe the answer is:

mar

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'spoil' is the definition.
(I know that spoil can be written as mar)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for mar that I've seen before include "Blight" , "wreck" , "Spanish main?" , "Disfigure" , "Damage; month (abbr.)" .)

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