Bet this would kill vampire! (5)

I believe the answer is:

stake

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'bet' is the definition.
(I know that bet can be written as stake)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for stake that I've seen before include "Post; money for bet" , "stout support" , "The money risked on a gamble" , "Pale" , "Sharpened post; sum bet" .)

I've seen this clue in The Sun.

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