President Mao angered, having been done (12)

I believe the answer is:

impersonated

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

'done' is the definition.
The definition and answer can be both to do with creating things as well as being past participle verbs.
Maybe you can see an association between them that I can't see?

'president mao angered having been' is the wordplay.
'president mao' can be anagrammed to 'IMPERSONATED'.
Though, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Another definition for impersonated that I've seen is " Pretended to be (someone)".)

I've seen this clue in The Independent.

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