Endless amount of tin around something liable to erupt (7)

I believe the answer is:

volcano

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'something liable to erupt' is the definition.
I can't tell whether this defines the answer.

'endless amount of tin around' is the wordplay.
'endless amount of' becomes 'vol' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'tin' becomes 'can' (synonyms).
'around' becomes 'o' (a round letter).
'vol'+'can'+'o'='VOLCANO'

Can you help me to learn more?

(Other definitions for volcano that I've seen before include "Erupting mountain" , "Etna is one, and Stromboli" , "Mountain (could be a heavy smoker!)" , "Exploding mountain" , "source of vents" .)

I've seen this clue in The Irish Times.

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