Multilingual letter to a son of Adam (5)

I believe the answer is:

babel

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'multilingual letter to a son of adam' is the definition.
I can't judge whether this definition defines the answer.

'letter to a son of adam' is the wordplay.
'letter' becomes 'b' (**).
'to a son of adam' becomes 'abel' (I've seen this before).
'b'+'abel'='BABEL'

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(Other definitions for babel that I've seen before include "confused sounds" , "Confusion of speech" , "Place of cacophony" , "pandemonium" , "Confused din of voices" .)

I've seen this clue in the Evening Standard.

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