Hail of projectiles from colossal volcano (5)

I believe the answer is:

salvo

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'hail of projectiles' is the definition.
'salvo' can be an answer for 'hail' (thesaurus). I'm not certain of the 'of projectiles' bit.

'from colossal volcano' is the wordplay.
'from' says the answer is hidden in the clue.
'SALVO' is hidden within 'colossal volcano'.

Can you help me to learn more?

(Other definitions for salvo that I've seen before include "Burst of firing" , "Burst (of applause, insults, artillery etc)" , "Simultaneous discharge of artillery" , "Ceremonial round of gunfire" , "Simultaneous discharge of fire" .)

I've seen this clue in The Independent.

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