Horror film stirring fears inside not for everyone (9)
I believe the answer is:
nosferatu
'horror film' is the definition.
(I've seen this before)
'stirring fears inside not for everyone' is the wordplay.
'stirring' indicates an anagram.
'inside' means one lot of letters goes inside another.
'for everyone' becomes 'U' (Universal film certificate).
'fears' anagrammed gives 'sfera'.
'sfera' going inside 'not' is 'nosferat'.
'nosferat'+'u'='NOSFERATU'
(Other definitions for nosferatu that I've seen before include "F.W. Murnau's early Dracula film" , "horror film" , "Old film" , "1922 Dracula film" .)