Colossal volley? Not entirely (5)

I believe the answer is:

salvo

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'colossal volley? not entirely' is the definition.
I can't tell whether this definition defines the answer.

'colossal volley? not entirely' is the wordplay.
'not entirely' says the answer is hidden in the clue.
'SALVO' is hidden within 'colossal volley'.

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(Other definitions for salvo that I've seen before include "Ceremonial round of gunfire" , "Discharge of weapons in unison" , "Rapid simultaneous shooting" , "Unusual excuse" , "Rounds delivered" .)

I've seen this clue in The Times.

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