Crossword Genius

Confession being task of Christian era? (9)

Ross

I believe the answer is:

admission

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

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

'task of christian era?' is the wordplay.
I cannot quite understand how this works, but
'task' could be 'mission' (I've seen this before) and 'mission' is located in the answer.
The remaining letters 'ad' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

'being' acts as a link.

Can you help me to learn more?

(Other definitions for admission that I've seen before include "The price of entry" , "Anything conceded" , "Entree" , "entry charge" , "Right to go in" .)

I've seen this clue in The Times.
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