Oriental festival, new (7)
I believe the answer is:
eastern
'oriental' is the definition.
(similar in meaning)
'festival new' is the wordplay.
'festival' becomes 'easter' (Christian festival).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'easter'+'n'='EASTERN'
(Other definitions for eastern that I've seen before include "Coming from the Orient" , "Chinese', for example" , "Could be Chinese" , "See 11" , "Possibly Japanese" .)