Knife in vampire movie (5)
I believe the answer is:
blade
'knife' is the definition.
(type of blade)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for blade that I've seen before include "See 24 Across" , "Cutting edge" , "London rail terminus" , "Flat part of an oar" , "Sword" .)