A fall of snow or lava he can fix (9)

I believe the answer is:

avalanche

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'a fall of snow' is the definition.
I know that 'snow' relates to this answer.

'lava he can fix' is the wordplay.
'fix' indicates anagramming the letters (I've seen 'fixed' mean this).
'lava'+'he'+'can'='lavahecan'
'lavahecan' with letters rearranged gives 'AVALANCHE'.

'or' is the link.

Can you help me to learn more?

(Other definitions for avalanche that I've seen before include "Snow slip" , "serious fall" , "heavy snowfall" , "Disastrous snowfall" , "Slide of a large amount of snow down a mountain" .)

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