Stories about a spoil-sport? (7)
I believe the answer is:
reports
'stories' is the definition.
('report' can be a synonym of 'story')
'about a spoil-sport?' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'a spoil' is an anagram indicator.
'sport' is an anagram of 'ports'.
're'+'ports'='REPORTS'
(Other definitions for reports that I've seen before include "Short accounts of the news" , "News stories" , "Accounts; bangs" , "Makes known" , "Writes about, booms" .)