Possible Clues:

• The nouveau-riche might be riding - with introductions
• Pretentious people have a way in winning skills
• Arrivistes
• Sour puss going off about rich nobodies
• Braggarts having extra words to say among posh floozies
• American obtains celebrity through training egotistic new kids on the block
• Nouveaux riches move art for kicks (but not superficially)
• Cocky, successful people
• Newly rich people
• Presumptuous newcomers, and what the answers to the starred clues literally have