English six-footer up fiery mountain (4)

I believe the answer is:

etna

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'fiery mountain' is the definition.
'Etna' can be an answer for 'mountain' (Etna is an example). I am not sure about the 'fiery' bit.

'english six-footer up' is the wordplay.
'english' becomes 'E' (abbreviation).
'six footer' becomes 'ant' (an ant has six feet).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'ant' backwards is 'tna'.
'e'+'tna'='ETNA'

Can you help me to learn more?

(Other definitions for etna that I've seen before include "a mount hotly tipped when it runs" , "Volcano in Sicily, quite neat" , "burning mountain" , "Mount . . . . is a volcano in Sicily" , "high peak" .)

I've seen this clue in The Sun.

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