Advancement in marketing? (9)
I believe the answer is:
promotion
This clue is a double definition.
'advancement' is the first definition.
('promotion' can be a synonym of 'advancement')
'marketing?' is the second definition.
(thesaurus)
'in' acts as a link.
(Other definitions for promotion that I've seen before include "upgrading" , "Puffing, perhaps" , "Advancement" , "movement?" , "sales campaign" .)