Celeb chef yet to finish bagel with the Italian dressing? (5,3)

I believe the answer is:

olive oil

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'dressing?' is the definition.
(I've seen this before)

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

(Other definitions for olive oil that I've seen before include "Light yellow dressing pressed from Mediterranean tree fruits" , "What may be extra virgin" , "Ingredient of vinaigrette" , "Substance pressed from fruit" , "Ingredient of salad dressing" .)

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

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