It's an explosion, darn it! (5)

I believe the answer is:

blast

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

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

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(Other definitions for blast that I've seen before include "Great time: explosion" , "Mild expletive - sharp explosion" , "Noise of explosion" , "slate" , "Blow up or swear" .)

I've seen this clue in the Evening Standard.

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