It has an explosive opening! (7)

I believe the answer is:

volcano

(Other definitions for volcano that I've seen before include "Eg, Cotopaxi" , "Etna is one, and Stromboli" , "Etna, for example" , "Dangerous mountain like Stromboli or Etna" , "Crater emitting lava" .)

I've seen this clue in The Guardian.

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