Going out with no one, southern Frenchman's upset (9)

'going' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'with no one southern frenchman's upset' is the wordplay.
'with' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral).
'southern' becomes 's' (abbreviation).
'frenchman' becomes 'serge' (Serge is a common French name).
'upset' says the letters should be written backwards.
'no'+'i'+'s'='nois'
'nois' next to 'serge' is 'noisserge'.
'noisserge' reversed gives 'EGRESSION'.

'out' acts as a link.

Can you help me to learn more?