Christian sacrament involved such a rite (9)

I believe the answer is:

eucharist

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'christian sacrament' is the definition.
'Eucharist' can be an answer for 'sacrament' (Eucharist is an example). I am unsure of the 'christian' bit.

'involved such a rite' is the wordplay.
'involved' is an anagram indicator (involved can mean confusing or complex).
'such'+'a'+'rite'='sucharite'
'sucharite' with letters rearranged gives 'EUCHARIST'.

Can you help me to learn more?

(Other definitions for eucharist that I've seen before include "church service" , "Consecrated bread" , "Mass" , "host" , "Holy Communion" .)

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

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