Possible Clues:

• Polluted
• That's enough to make your old relative a dirty old man
• Defiled part of prince's 'monstrous carbuncle' - an eyesore meriting it
• Relatively old, an unwashed one
• Soiled like an uncle
• (Ritually) impure
• Is the old fellow an individual that could do with a wash?
• With an addition the old man is dirty
• Filthy article relative put on
• Dirty old man�s brother, a Nationalist