Possible Clues:

• Piers Paul Read's sudden rise was earlier than Catherine Cookson's
• Sup bubbly and bitter with social climber
• Never down at the end - never much background
• Working with us part time, he's presumptuous and arrogant
• Bumptious parvenu
• He's certainly not of elevated origin!
• Arrogant person
• Bold newcomer riding over jump
• Arrogant type at university joining society, loose woman
• Not down at the beginning but beginning to have arrived