Discharge of colossal volume (5)

I believe the answer is:

salvo

'discharge' is the definition.
(I've seen this before)

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

(Other definitions for salvo that I've seen before include "Simultaneous artillery fire" , "Discharge of weapons in unison" , "Fiery outburst" , "Outburst, as of applause" , "A number of shots" .)

I've seen this clue in The Sun and The Times.

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