Stories concerning tantrum coming up (7)
I believe the answer is:
reports
'stories' is the definition.
('report' can be a synonym of 'story')
'concerning tantrum coming up' is the wordplay.
'concerning' becomes 're'.
'tantrum' becomes 'strop'.
'coming up' says the letters should be written backwards.
'strop' backwards is 'ports'.
're'+'ports'='REPORTS'
(Other definitions for reports that I've seen before include "Short accounts of the news" , "Sounds of gunfire" , "Writes about, booms" , "that follow the shooting?" , "Accounts; bangs" .)