Discharge some proposal voluntarily (5)

I believe the answer is:

salvo

'discharge' is the definition.
(thesaurus)

'some proposal voluntarily' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'SALVO' can be found hidden inside 'proposal voluntarily'.

(Other definitions for salvo that I've seen before include "Aussie evangelist" , "reservation" , "Simultaneous discharge of artillery" , "Burst (of applause, insults, artillery etc)" , "Fiery outburst" .)

I've seen this clue in The Telegraph.

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