Pacific island festival (6)
I believe the answer is:
easter
This clue might be a double definition.
'pacific island' is the first definition.
'easter' can be an answer for 'island' (I've seen this before). I'm unsure of the 'pacific' bit.
'festival' is the second definition.
(Christian festival)
Can you help me to learn more?
(Other definitions for easter that I've seen before include "Time to parade" , "A terse sort of Spring festival?" , "Main Christian festival" , "Teaser about Christian festival" , "Major Christian festival in April" .)