Everyone taken in by most of band's blatant publicity (8)
I believe the answer is:
ballyhoo
'blatant publicity' is the definition.
(I've seen this before)
'everyone taken in by most of band's' is the wordplay.
'everyone' becomes 'all' (I've seen this before).
'taken in' is an insertion indicator.
'most of' means to remove the last letter.
'band' becomes 'hoop' (hoop is a kind of band).
'all' going inside 'by' is 'bally'.
'hoop' with its last letter taken off is 'hoo'.
'bally'+'hoo'='BALLYHOO'
(Other definitions for ballyhoo that I've seen before include "Much fuss" , "Great fuss" , "Noisy uproar - blatant publicity" , "Extravagant publicity or fuss" , "Noisy or sensational publicity, hype" .)