Explosion killing head of Russian administrative region (5)

I believe the answer is:

blast

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'explosion' is the definition.
(blast is a kind of explosion)

I don't understand how the remainder of the clue works.

(Other definitions for blast that I've seen before include "Severely criticise" , "Loud horn sound" , "Great time: explosion" , "Effect of explosion" , "Noise of explosion" .)

I've seen this clue in The Independent.

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