Old fish market scandal over presentation of accounts? (12)

I believe the answer is:

billingsgate

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'presentation of accounts?' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'old fish market scandal' is the wordplay.
'old fish market' becomes 'billings' (I can't justify this - if you can you should believe this answer much more).
'scandal' becomes 'gate' (as in Watergate and other formations).
'billings'+'gate'='BILLINGSGATE'

'over' is the link.

Can you help me to learn more?

(Other definitions for billingsgate that I've seen before include "Swearing" , "London fish market" .)

I've seen this clue in The Times.

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