Possible Clues:

• 'Assistant, professor say (7)'
• A record spinner with a French court auxiliary
• Accessory for a formal suit with new cut around top of neck
• Something joined or added
• Pretend to pack smart dress with a foreign rider
• Do without jacket, one used by Parisian rider?
• Something joined but not essentially a part
• Auxiliary judge's start in a dingy court
• Accessory with evening dress: one must get into function
• Type of professor