Rendezvous in French bar (9)
I believe the answer is:
encounter
'rendezvous' is the definition.
(a rendezvous is a meeting or encounter)
'in french bar' is the wordplay.
'in french' becomes 'en' ('in' in French).
'bar' becomes 'counter' (as in the counter of a pub or bar).
'en'+'counter'='ENCOUNTER'
(Other definitions for encounter that I've seen before include "Unexpected meeting" , "Meet by chance with encore nut" , "Bump into" , "Meet, come across" , "See 19" .)