Fruit in cold fortified wine — no starter! (6)
I believe the answer is:
cherry
'fruit' is the definition.
(cherry is a kind of fruit)
I don't understand how the rest of the clue works.
(Other definitions for cherry that I've seen before include "Tree; red fruit" , "cheer? No longer" , "one likely to be picked?" , "Small red stone-fruit from tree" , "Deep red like small round fruit" .)