Possible Clues:

• Parvenus
• Social climbers, arrivistes
• Social climbers, and what the answers to the starred clues literally have
• Cocky newcomers
• Start-ups built by social climbers
• Presumptuous nouveaux riches
• Social climbers
• People who have risen suddenly to authority, arrogant with it
• Arrogant people just arrived in high positions
• Arrogant types at university researching initially in statistics