Crossword Genius

Salvo possible but not rounds (5)

Ross

I believe the answer is:

ovals

I'm a little stuck... Click here to teach me more about this clue!

'not rounds' is the definition.
(ovals are not perfectly round or circular)

'salvo possible' is the wordplay.
'salvo' can be anagrammed to 'OVALS'.
But, I am not clear how the anagram is indicated.

'but' is the link.

Can you help me to learn more?

(Another definition for ovals that I've seen is " Elliptical shapes".)

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