Crossword Genius

Marks that upset good men (6)

Ross

I believe the answer is:

stains

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'marks' is the definition.
(I know this)

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

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(Other definitions for stains that I've seen before include "Sullies" , "Discolorations on satins" , "Discolours or dyes wood" , "Discolourations on satins" , "Discolorations or dirt marks" .)

I've seen this clue in The Irish News.
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