Classic (7)
'classic' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for vintage that I've seen before include "High quality wine" , "Wine harvest" , "Good quality (wine)" , "classic" , "Date of origin (of wine etc)" .)
(Other definitions for cult that I've seen before include "Narrow or excessive devotion to person or religious system" , "System of religious beliefs and rituals" , "Strange religious group" , "they believe" , "Unorthodox or false religion" .)