Person dining, taking in opening of spring festival (6)

I believe the answer is:

easter

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'spring festival' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for easter that I've seen before include "A steer (anag.)" , "Festival after Lent" , "Time to celebrate" , "See art at this time of year" , "Time to parade" .)

I've seen this clue in The Telegraph.

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