Possible Clues:

• Something eaten with pained expression in appearance? On the contrary
• Unexpected absentee
• Godot or Guffman, famously
• Flaky ticket holder
• One doesn't appear to consume contents of bowl
• She doesn't appear to eat innards of fowl
• Ticket waster
• One not keeping an appointment — who's on (anag)
• Possible reason for an empty seat
• One's failed to turn up with food -- that hurts!