Display concern for entertainment industry (4,8)
I believe the answer is:
show business
'entertainment industry' is the definition.
('show business' can be a synonym of 'entertainment industry')
'display concern' is the wordplay.
'display' becomes 'show' ('show' can be a synonym of 'display').
'concern' becomes 'business' (business is a kind of concern**).
'show'+'business'='SHOW-BUSINESS'
'for' acts as a link.
(Other definitions for show business that I've seen before include "The world of entertainment" , "Theatre/music industry" , "Entertainment industry" .)