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Bad-mannered crusader dismisses scar (4)

Ross

I believe the answer is:

rude

I'm a little stuck... Click here to teach me more about this clue!

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for rude that I've seen before include "Impolite or coarse" , "dirty" , "having no manners?" , "Uncouth" , "Impertinent" .)

I've seen this clue in the Irish Times (Crosaire) and The Irish Times.
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