You emptied mine first, creamier by half and more delicious! (7)

I believe the answer is:

yummier

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'more delicious' is the definition.
('yummy' can be a synonym of 'delicious')

I cannot understand how the remainder of the clue works.

(Other definitions for yummier that I've seen before include "More tasty" , "more delectable" , "more attractive" , "with better flavour" .)

I've seen this clue in the Sydney Morning Herald.

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