It uses rounds or ovals (5)

I believe the answer is:

salvo

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'it uses rounds' is the definition.
The definition suggests a singular noun which matches the answer.

'ovals' is the wordplay.
'ovals' anagrams to 'SALVO'.
But, I'm not sure how this is indicated.

'or' acts as a link.

Can you help me to learn more?

(Other definitions for salvo that I've seen before include "Unusual excuse" , "Outburst, as of applause" , "Series of shots" , "Simultaneous firing of weapons" , "Rapid simultaneous discharge of firearms" .)

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

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