Another bit maps rite of passage (7)

I believe the answer is:

baptism

I'm a little stuck... Click here to teach me more about this clue!

'rite of passage' is the definition.
(I know this)

'another bit maps' is the wordplay.
'another' is an anagram indicator.
'bit'+'maps'='bitmaps'
'bitmaps' anagrammed gives 'BAPTISM'.

Can you help me to learn more?

(Other definitions for baptism that I've seen before include "Religious rite involving water" , "Initiation ceremony" , "Christian sacrament that symbolises admission to the church" , "Christian sacrament signifying rebirth" , "Religious ceremony" .)

I've seen this clue in the Sydney Morning Herald.

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