Initially erupting, this naturally active volcano (4)

I believe the answer is:

etna

'volcano' is the definition.
(Etna is an example)

'initially erupting this naturally active' is the wordplay.
'initially' indicates taking the first letters.
The initial letters of 'erupting this naturally active' is 'ETNA'.

(Other definitions for etna that I've seen before include "Italian volcano" , "Neat (anag)" , "Europe's highest active volcano" , "Dangerous peak" , "Volcano in Sicily, quite neat" .)

I've seen this clue in The Times.

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