Introductory course? (5)
I believe the answer is:
salad
'introductory course' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for salad that I've seen before include "See 1 ac" , "Lettuce, cucumber etc" , "Counter serving cold vegetable dishes" , "Cold dish of various vegetables," , "Cold vegetable dish" .)