Organised discharge of colossal volume (5)

I believe the answer is:

salvo

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'organised discharge' is the definition.
The definition and answer are not the same part of speech.

'of colossal volume' is the wordplay.
'of' indicates the answer is hidden within the clue.
'SALVO' is hidden within 'colossal volume'.

Can you help me to learn more?

(Other definitions for salvo that I've seen before include "Simultaneous discharge of guns" , "A volley of shots, perhaps as salute" , "Discharge of gunfire" , "Simultaneous burst of gunfire" , "Firing of guns as a salute" .)

I've seen this clue in The Independent.

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