Author's poster of a French region (6,6)

I believe the answer is:

norman mailer

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

'a french region' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'author's poster' is the wordplay.
'author's' becomes 'norman' (I can't justify this - if you can you should believe this answer much more).
'poster' becomes 'mailer' (I've seen this before).
'norman'+'mailer'='NORMAN MAILER'

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.

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