Knife in Snipes vampire movie (5)

I believe the answer is:

blade

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'knife' is the definition.
(type of blade)

I can't explain the rest of the clue.

(Other definitions for blade that I've seen before include "Flat part of an oar" , "Cutting part of grass?" , "See 24 Across" , "Leaf, of grass, say" , "Sword" .)

I've seen this clue in The Sun.

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