Crossword Genius

Discuss keeping in son, as one tells all (9)

Ross

I believe the answer is:

confessor

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'one tells all' is the definition.
I can't judge whether this definition defines the answer.

'discuss keeping in son as' is the wordplay.
'discuss' becomes 'confer' (conferring is a kind of discussing).
'keeping' indicates putting letters inside.
'in son' becomes 's' (I am not sure about this - if you are sure you should believe this answer much more).
'as' becomes 'so' (I've seen this in other clues).
's'+'so'='sso'
'confer' going around 'sso' is 'CONFESSOR'.

Can you help me to learn more?

(Other definitions for confessor that I've seen before include "Edward, for example?" , "One who admits to sins" , "One admitting sins" , "Edward the --, king of England" , "One who acknowledges" .)

I've seen this clue in The Telegraph.
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