New combination of art and levity in screen entertainment (7,2)
I believe the answer is:
reality tv
'screen entertainment' is the definition.
(type of entertainment programme)
'new combination of art and levity' is the wordplay.
'new combination of' indicates an anagram.
'and' says to put letters next to each other.
'art'+'levity'='artlevity'
'artlevity' with letters rearranged gives 'REALITY TV'.
'in' acts as a link.
(Other definitions for reality tv that I've seen before include "Television genre using members of the public" , "Broadcast" .)