Crossword Genius

Key that might be part of a chain (4)

Ross

I believe the answer is:

isle

(Other definitions for isle that I've seen before include "Eg, Iona" , "Small landmass" , "Small seabound place" , "Skye or Capri?" , "Lies about small land mass." .)

I've seen this clue in The New York Times.
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