26 d 4 letters
Clue is: Bush left out.
I had H-l-
Given that there's a theme of "8 clues lacking definition, their solutions are of a kind" abnd given that I have 7 other Islands, I imagine that the answet is Holy. If I take 'l' out, I get Hoy - but cannot find any reference to that as a Bush and I don't see a connection with transatlantic Presidents, either. Could someone explain and/or give me the correct answer, please?