Explosive feature of a quiet natural environment (4)

I believe the answer is:

etna

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'explosive feature' is the definition.
'etna' can be an answer for 'feature' (I have seen 'Feature of Sicily' mean 'etna' so perhaps 'feature' could also mean 'etna'). I'm unsure of the 'explosive' bit.

'of a quiet natural environment' is the wordplay.
'of' says the answer is hidden in the clue.
'ETNA' is hidden in the letters of 'quiet natural environment'.

Can you help me to learn more?

(Other definitions for etna that I've seen before include "Neat (anag)" , "Sicilian landmark" , "Volcano in Sicily, quite neat" , "one blowing top?" , "Highest active volcano in Europe" .)

I've seen this clue in The Globe and Mail.

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