Crossword Genius

You are back, I say, but starting, I see, reporting on what Caesar got over (7)

Ross

I believe the answer is:

rubicon

I'm a little stuck... Click here to teach me more about this clue!

'you' is the definition.
Both the answer and definition are singular nouns.
Maybe there's a link between them I don't understand?

'back i say but starting i see reporting on what caesar got over' is the wordplay.
I cannot quite understand how this works, but
'i' is found in the answer.
'see' could be 'c' (the word for the letter, according to Chambers) and 'c' is found within the answer.
'on' is found in the answer.
The remaining letters 'rub' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'are' is the link.

Can you help me to learn more?

(Other definitions for rubicon that I've seen before include "Its crossing irrevocable" , "Caesar crossed this river to take irrevocable step" , "Italy/Gaul boundary" , "River, point of no return" , "5 significantly crossed!" .)

I've seen this clue in the Sydney Morning Herald.
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