Norman writer (6)
I believe the answer is:
mailer
This clue is a double definition.
'norman' is the first definition.
(I've seen this before)
'writer' is the second definition.
(I know that Mailer is a writer)
(Other definitions for mailer that I've seen before include "Poster" , "One putting armour on" , "American author of The Naked and the Dead, d. 2007" , "novelist" , "writer from America" .)