Crossword Genius

Sweet-natured but slightly volcanic eminence (4)

Ross

I believe the answer is:

etna

I'm a little stuck... Click here to teach me more about this clue!

'slightly volcanic eminence' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'sweet-natured' is the wordplay.
'ETNA' is hidden in amongst the letters.
But, I'm unsure how the hidden word is indicated.

'but' is the link.

Can you help me to learn more?

(Other definitions for etna that I've seen before include "A feature of Sicily" , "Explosive type" , "source of fumes?" , "Neat kind of European volcano" , "Sicily's 15" .)

I've seen this clue in the Sydney Morning Herald.
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