European flower festival (6)

I believe the answer is:

easter

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'festival' is the definition.
(Christian festival)

I can't explain the rest of the clue.

(Other definitions for easter that I've seen before include "Teaser about Christian festival" , "Annual religious festival" , "Christian celebration of the Resurrection" , "Christian festival in Spring" , "Major Christian festival in April" .)

I've seen this clue in The Telegraph and The Sun.

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