Immigration island (5)
I believe the answer is:
ellis
'immigration island' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ellis that I've seen before include "American island" , "Havelock --, English essayist" , "-- Island, New York entry point" , "Havelock --, psychologist" , "expert in sexual psychology" .)