A Norman poster? (6)

I believe the answer is:

mailer

I believe this clue is a double definition.

'a norman' is the first definition.
(I've seen this before)

'poster?' is the second definition.
(I've seen this before)

(Other definitions for mailer that I've seen before include "writer from America" , "One putting armour on" , "American author of The Naked and the Dead, d. 2007" , "person at the post?" , "Poster" .)

I've seen this clue in the Evening Standard.

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