Rite involving water or fire? (7)

I believe the answer is:

baptism

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

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

(Other definitions for baptism that I've seen before include "Religious ceremony" , "Baby's wetting of the head" , "Religious rite involving water" , "Christian sacrament requiring pouring of water" , "Christian sacrament that symbolises admission to the church" .)

I've seen this clue in The Sun.

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