When unmasked, is brazen (4-5)

I believe the answer is:

bare-faced

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'brazen' is the definition.
Both the answer and definition are adjectives.
Perhaps there's an association between them I don't understand?

I don't understand the remainder of the clue.

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(Another definition for bare-faced that I've seen is " Shameless".)

I've seen this clue in the Evening Standard.

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