Bump into Parisian in buffet (9)
I believe the answer is:
encounter
'bump into' is the definition.
(synonyms)
'parisian in buffet' is the wordplay.
'parisian in' becomes 'en' ('in' in French).
'buffet' becomes 'counter' (synonyms).
'en'+'counter'='ENCOUNTER'
(Other definitions for encounter that I've seen before include "Come accross, meet (9)" , "tackle" , "Meet; confrontation" , "See 19" , "Unexpected meeting" .)