Superficial display is all-embracing (7)
I believe the answer is:
shallow
'superficial' is the definition.
('shallow' can be similar in meaning to 'superficial')
'display is all-embracing' is the wordplay.
'display' becomes 'show' ('show' can be a synonym of 'display').
'embracing' means one lot of letters goes inside another.
'show' going around 'all' is 'SHALLOW'.
(Other definitions for shallow that I've seen before include "incapable of serious thought" , "Of water, not deep" , "Insincere" , "Frivolous" , "Superficial" .)