Superficial entertainment captivates everyone (7)
I believe the answer is:
shallow
'superficial' is the definition.
('shallow' can be similar in meaning to 'superficial')
'entertainment captivates everyone' is the wordplay.
'entertainment' becomes 'show' (show is a kind of entertainment).
'captivates' is an insertion indicator.
'everyone' becomes 'all' (I've seen this before).
'show' enclosing 'all' is 'SHALLOW'.
(Other definitions for shallow that I've seen before include "Insincere" , "justice" , "Of water, not deep" , "Lacking depth" , "Not profound" .)