Crossword Genius

Bad marks for errant magistrates lacking rebuke (7)

Ross

I believe the answer is:

stigmas

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'bad marks' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for stigmas that I've seen is " Symbols of disgrace or infamy".)

I've seen this clue in The Globe and Mail.
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