Vulgarian charge overturned prior to brief rendezvous (7)
I believe the answer is:
parvenu
'vulgarian' is the definition.
(thesaurus)
'to brief rendezvous' is the wordplay.
'to' becomes 'par' (I can't explain this - if you can you should give a lot more credence to this answer).
'brief' means to remove the last letter (a shorter or briefer version of the word).
'rendezvous' becomes 'venue' (I've seen this before).
'venue' with its final letter taken off is 'venu'.
'par'+'venu'='PARVENU'
'charge overturned prior' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for parvenu that I've seen before include "Nouveau riche" , "Arriviste" , "Newly rich person" , "One newly risen to wealth or power" , "One who climbs" .)