Erroneously delivers a description of mirrors (8)

I believe the answer is:

silvered

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'a description of mirrors' is the definition.
I can't judge whether this defines the answer.

'erroneously delivers' is the wordplay.
'erroneously' is an anagram indicator.
'delivers' anagrammed gives 'SILVERED'.

Can you help me to learn more?

(Another definition for silvered that I've seen is " Like posh cutlery".)

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

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