Petunia picked in prime locations for Sicilian eminence (4)

I believe the answer is:

etna

'sicilian eminence' is the definition.
(volcano on Sicily)

I don't understand the remainder of the clue.

(Other definitions for etna that I've seen before include "it may produce steam and ash" , "Volcano in Sicily, quite neat" , "It could erupt" , "Sicilian landmark" , "Neat (anag)" .)

I've seen this clue in The Times.

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