Crossword Genius

Ascending feature of Snowdon, a cloven peak, one gets hot (7)

Ross

I believe the answer is:

volcano

I'm a little stuck... Click here to teach me more about this clue!

'ascending feature' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'snowdon a cloven peak one gets hot' is the wordplay.
'VOLCANO' is hidden backwards in amongst the letters.
But, I'm uncertain how this is indicated.

'of' is the link.

Can you help me to learn more?

(Other definitions for volcano that I've seen before include "eg Mount Etna" , "St Helens?" , "Site of eruption" , "Eg, Eyjafjallajokull" , "One expelling lava etc." .)

I've seen this clue in The Telegraph.
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