### Clue: Doubly hard to leave diabolical island (5)
### Answer: ELLIS 
 ### Explanation: Doubly hard to leave diabolical island (5)
(h)**ELLIS**(h) ("diabolical" with H removed twice, ie "doubly H(ard) has left") 
*Ellis Island is an island in New York where new immigrants to the US were processed until 1954.