One egg per year! (6)

I believe the answer is:

easter

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'one egg' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'per year' is the wordplay.
'per' becomes 'ea'.
'year' becomes 'ster' (I am not sure about this - if you are sure you should believe this answer much more).
'ea'+'ster'='EASTER'

Can you help me to learn more?

(Other definitions for easter that I've seen before include "Monday of 1916 Rising" , "Time to celebrate" , "Christian festival in Spring" , "Important Christian festival" , "A steer (anag.)" .)

I've seen this clue in the Evening Standard.

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