Possible Clues:

• Letter being one of two?
• One who shares a lodging
• One sharing with me has opportunity to finish board game
• *Fellow freshman you meet on Day 1 at college
• Person with whom one shares
• Accommodation sharer
• Living space sharer
• One who may be sexiled
• Shares half of 18 across with judge holding old, old Frenchmen
• Reason to write your name on your food, maybe