Exaggerated publicity (4)
I believe the answer is:
hype
'exaggerated publicity' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hype that I've seen before include "Sensational publicity" , "Overdo promotion" , "Publicity stunt" , "Build up" , "Extravagant publicity or promotion" .)