Never-ending Oriental festival (6)
I believe the answer is:
easter
'festival' is the definition.
(Christian festival)
'never-ending oriental' is the wordplay.
'never ending' means to remove the last letter.
'oriental' becomes 'eastern' (synonyms).
'eastern' with its last letter taken away is 'EASTER'.
(Other definitions for easter that I've seen before include "- Day; - bunny" , "Parade; egg; lily" , "Christian festival of celebration" , "Annual religious festival" , "Teaser about Christian festival" .)