Extent of anger about origin of news (5)
I believe the answer is:
range
'extent' is the definition.
(range is a kind of extent)
'anger about origin of news' is the wordplay.
'anger' becomes 'rage' (rage is a kind of anger).
'about' is an insertion indicator.
'origin of' indicates taking the first letters.
The initial letter of 'news' is 'n'.
'rage' going around 'n' is 'RANGE'.
'of' is the link.
(Other definitions for range that I've seen before include "Take sides" , "Open grazing land or cooking stove" , "1 across [CLASSIFY]" , "Selection" , "Extent - shooting area" .)