Plate (4)
'plate' is the definition.
(type of plate)
This is all the clue.
(Other definitions for dish that I've seen before include "Cooking vessel" , "Menu item - plate" , "Gorgeous person - plate" , "Food container; aerial" , "Ruin" .)
(Other definitions for disc that I've seen before include "Capital of India" , "Layer of cartilage between spinal vertebrae" , "'Round, flat shape (4)'" , "something moving in the spine" , "Back part" .)