Oval tablet swallowed up by doctor, see (7)

I believe the answer is:

ellipse

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'oval' is the definition.
(I know that oval can be written as ellipse)

I don't understand the rest of the clue.

(Other definitions for ellipse that I've seen before include "Egg-shaped geometrical figure" , "Sell pie badly to get a geometrical figure" , "Figure like flattened circle" , "Regular oval shape" , "Inclined plane through a cone" .)

I've seen this clue in The Guardian.

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