Crossword Genius

Said to have regretted being impolite (4)

Ross

I believe the answer is:

rude

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'impolite' is the definition.
(similar in meaning)

I cannot understand how the rest of the clue works.

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(Other definitions for rude that I've seen before include "Impolite - simple" , "Offensively impolite" , "'Bad-mannered, discourteous (4)'" , "Unpleasant" , "Base" .)

I've seen this clue in The Irish Independent.
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