State prosecutor featured in paper (5)
I believe the answer is:
sudan
'state' is the definition.
(Sudan is an example)
'prosecutor featured in paper' is the wordplay.
'prosecutor' becomes 'D.A.' (District Attorney).
'featured in' means one lot of letters goes inside another.
'paper' becomes 'sun' (The Sun, UK newspaper).
'da' inserted inside 'sun' is 'SUDAN'.
(Other definitions for sudan that I've seen before include "Country bordering the Red Sea" , "African nation" , "Country in NC Africa, capital Khartoum" , "African region" , "Sun ad for the African state" .)