Religious celebration ultimately entertains prince and queen (5)

I believe the answer is:

seder

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'religious celebration' is the definition.
The definition suggests a singular noun which matches the answer.

'ultimately entertains prince and queen' is the wordplay.
'ultimately' suggests the final letters.
'queen' becomes 'er' (abbreviation for Elizabeth Regina).
The final letters of 'entertains prince and' are 'sed'.
'sed'+'er'='SEDER'

Can you help me to learn more?

(Other definitions for seder that I've seen before include "meal of religious significance" , "religious ceremony" , "Jewish festival" , "ceremonial meal" , "Passover dinner" .)

I've seen this clue in The Independent.

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