Preview clip with culprit finally sent down ... this calls for a celebration (6)
I believe the answer is:
easter
'celebration' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for easter that I've seen before include "holiday time" , "Annual religious festival" , "A terse sort of Spring festival?" , "Christian festival of celebration" , "Snug retreat" .)