British saying about character in AMND? (6)

I believe the answer is:

bottom

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'amnd?' is the definition.
I can't judge whether this definition defines the answer.

'british saying about character' is the wordplay.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'saying about' becomes 'otto' (I can't explain this - if you can you should believe this answer much more).
'character' becomes 'm'.
'b'+'otto'+'m'='BOTTOM'

'in' is the link.

Can you help me to learn more?

(Other definitions for bottom that I've seen before include "Shakespeare's weaver" , "Shakespearean - rear" , "Lowest part or underside" , "Low point" , "Base; Shakespearean character" .)

I've seen this clue in The Independent.

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