Material from most evil news boss (7)
I believe the answer is:
worsted
'material' is the definition.
(worsted is a kind of material)
'most evil news boss' is the wordplay.
'most evil' becomes 'worst' (similar in meaning).
'news boss' becomes 'ed' (short for editor).
'worst'+'ed'='WORSTED'
'from' acts as a link.
(Other definitions for worsted that I've seen before include "taken to the cleaners" , "sort of suit?" , "Woollen fabric" , "cloth" , "Took to the cleaners" .)