Initially eschewing this naturally active volcano (4)

I believe the answer is:

etna

'volcano' is the definition.
(Mount Etna)

'initially eschewing this naturally active' is the wordplay.
'initially' suggests taking the first letters.
The first letters of 'eschewing this naturally active' is 'ETNA'.

(Other definitions for etna that I've seen before include "Volcanic mount in Sicily" , "feature spewing lava" , "Active European volcano" , "Volcano in Italy" , "Explosive type" .)

I've seen this clue in The Sun.

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