Oratorio is a new production in network (7)
I believe the answer is:
messiah
'oratorio' is the definition.
(Messiah is an example)
'is a new production in network' is the wordplay.
'new production' is an anagram indicator.
'in' is an insertion indicator.
'network' becomes 'mesh' ('mesh' can be a synonym of 'network'**).
'is'+'a'='isa'
'isa' is an anagram of 'sia'.
'sia' put inside 'mesh' is 'MESSIAH'.
(Other definitions for messiah that I've seen before include "Hallelujah chorus work" , "Handel's oratorio first performed in Dublin" , "Gospel saviour as prophesied" , "champion, possibly" , "The Promised One" .)