Explosion is fun (5)

I believe the answer is:

blast

I believe this is a double definition.

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

'is fun' is the second definition.

(Other definitions for blast that I've seen before include "Damn - explosion" , "Noise of explosion" , "Loud noise from a horn" , "Explosion - mild oath" , "Report" .)

I've seen this clue in The Mirror.

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