Publicist (8)
I believe the answer is:
promoter
'publicist' is the definition.
(I know that promoter is a type of advertising person)
This is all the clue.
(Other definitions for promoter that I've seen before include "Find me in torpor like publicist of product" , "One books entertainments" , "Sponsor" , "Impresario" , "Organiser (of a sporting event)" .)