Salad dressing ingredient (5,3)
I believe the answer is:
olive oil
'salad dressing ingredient' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for olive oil that I've seen before include "dressing maybe" , "Substance pressed from fruit" , "What may be extra virgin" , "Light yellow dressing pressed from Mediterranean tree fruits" , "Pressed cooking ingredient" .)