New York Harbor island (5)
I believe the answer is:
ellis
'new york harbor 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 "- Island, former reception point for US immigrants" , "- - Peters (novelist)" , "island close to New York" , "-- Island, New York entry point" , "Havelock --, psychologist" .)