Extravagant promotion (4)
I believe the answer is:
hype
'extravagant promotion' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for hype that I've seen before include "Sales gimmick" , "Intensive promotion or excitement" , "Promotional publicity" , "Extravagant publicity or promotion" , "Extravagant promotion of a person or product" .)