### Clue: Insane rave-up to involve northern arriviste (7)
### Answer: PARVENU 
 ### Explanation: Definition: arriviste
 **Anagram of**(Insane) RAVE-UP **containing** N(abbrev. for "northern").
Defn: …./one who has recently gained power, success, wealth, etc. and is regarded as an upstart.