Crossword Genius

Book has the ability to offend for a start -- might one blow one's top? (7)

Ross

I believe the answer is:

volcano

(Other definitions for volcano that I've seen before include "Etna is one, and Stromboli", "Eg, Cotopaxi", "Vent in earth's crust", "A fissure in the earth's crust with molten rock", "Lava-spewing mountain".)

I've seen this clue in The Telegraph.
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