Crossword Genius

Carelessness evident, having cut right cheek (9)

Ross

I believe the answer is:

impudence

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'cheek' is the definition.
(I know that cheek can be written as impudence)

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

Can you help me to learn more?

(Other definitions for impudence that I've seen before include "Cheek" , "Sauce" , "assurance" , "Audacity" , "Boldness and insolence" .)

I've seen this clue in The Telegraph.
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