Crossword Genius

Discharge from the artillery (5)

Ross

I believe the answer is:

salvo

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for salvo that I've seen before include "Ceremonial shots" , "Sudden round of applause" , "reservation" , "Unusual excuse" , "Round of fire" .)

I've seen this clue in The Globe and Mail.
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