Possible Clues:

• One found guilty on the wrong grounds
• Uninvited visitor
• Lord's asked to forgive this uninvited guest
• One who intrudes on property without permission
• Gatecrasher perhaps to rest uneasily with result in hospital
• One maybe poaching very old hat from French king
• Guard dog's quarry
• Opposite of ''invitee''
• One has no right to be on land
• Dad's protected by lock here, putting off outside intruder