The aforementioned bit of assault on me (4)

I believe the answer is:

same

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'the aforementioned' is the definition.
(thesaurus)

'bit of assault on me' is the wordplay.
'bit of assault' becomes 'sa' (I am not sure about this - if you are sure you should believe this answer much more).
'on' is a charade indicator (letters next to each other).
'sa'+'me'='SAME'

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(Other definitions for same that I've seen before include "Identical, unchanged" , "Ditto" , "Identical or similar" , "Equal in amount or value" , "Identical, not different" .)

I've seen this clue in the Evening Standard.

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