Square here almost round? (4)

I believe the answer is:

oval

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'almost round?' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

(Other definitions for oval that I've seen before include "Like eggs" , "Ellipse" , "Shape of US president's office" , "Squashed circle" , "Elliptical figure" .)

I've seen this clue in The Sun.

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