Tiresome divas cavorting in a scary film? (8,5)
I believe the answer is:
disaster movie
'a scary film?' is the definition.
(film genre)
'tiresome divas cavorting' is the wordplay.
'cavorting' is an anagram indicator.
'tiresome'+'divas'='tiresomedivas'
'tiresomedivas' is an anagram of 'DISASTER MOVIE'.
'in' is the link.
(Other definitions for disaster movie that I've seen before include ""Titanic", perhaps" , "Film having catastrophe as its main theme" .)