I understand that "c'est" is used here because of the un which I guess makes it count as a modified noun, but I'm not clear whether there's any difference in meaning between these two phrasings when trying to express "He's a lawyer."
Il est avocat.
C'est un avocat.
C'est un avocat vinaigrette
. (But the first can't, asil
can only mean a person, not a fruit)