Screen star has rude journalist retreating (8)
I believe the answer is:
sunshade
'screen' is the definition.
(thesaurus)
'star has rude journalist retreating' is the wordplay.
'star' becomes 'sun' (the Sun is a star).
'rude' is an anagram indicator.
'journalist' becomes 'ed' (short for editor).
'retreating' is a reversal indicator.
'ed' written backwards gives 'de'.
'has' with letters rearranged gives 'sha'.
'sun'+'sha'+'de'='SUNSHADE'
(Other definitions for sunshade that I've seen before include "Awning or parasol, for example" , "protective cover" , "shelter" , "Awning or parasol will provide it" .)