Possible Clues:

• Here there's half a century, and it's in water
• Ellis, e.g.
• Rhodes is one I defame without hesitation
• Pitcairn, e.g.
• See 24
• Boffin, Baffin or Barbados
• Separate part of one's country
• ---
• The 'I' of Canada's P.E.I.
• Water-girt land