Entertainer’s invitation to eat outside in French (10)
I believe the answer is:
comedienne
'entertainer's' is the definition.
(comedienne is a kind of entertainer)
'invitation to eat outside in french' is the wordplay.
'invitation' becomes 'come' (an invitation to come).
'to eat' becomes 'dine' (to dine is to eat a meal).
'outside' is an insertion indicator.
'in french' becomes 'en' ('in' in French).
'dine' placed around 'en' is 'dienne'.
'come'+'dienne'='COMEDIENNE'
(Other definitions for comedienne that I've seen before include "Female comedy actor" , "Funny female performer" , "stand-up entertainer?" , "Rivers perhaps" , "Female humorist" .)