Former news chief eating sweet, fulfilled (8)
I believe the answer is:
executed
'fulfilled' is the definition.
('execute' can be a synonym of 'fulfil')
'former news chief eating sweet' is the wordplay.
'former' becomes 'ex' (prefix meaning former or onetime).
'news chief' becomes 'ed' (editor, newspaper boss).
'eating' is an insertion indicator.
'sweet' becomes 'cute' (cute can mean sweet or adorable).
'ed' enclosing 'cute' is 'ecuted'.
'ex'+'ecuted'='EXECUTED'
(Other definitions for executed that I've seen before include "Produced" , "Beheaded" , "Done (to death?)" , "Put a plan into effect" , "Performed" .)