Possible Clues:

• In social event, sit out, showing aloofness
• Reserve one's seat at last in the ballet?
• Aloofness is last thing host needs in disco, for instance
• Length from here to there
• Length between two points
• 26.2 miles, for a marathon
• Remoteness of girl with attitude
• The measured length between two points in space
• Sit awkwardly during social function's interval
• It's prepared during social event in space