Lake Superior's ___ Royale (4)

I believe the answer is:

isle

(Other definitions for isle that I've seen before include "Land cut off by water" , "The Lake ... of Innisfree (W.B.Yeats)" , "like 'Hoy!'" , "It lies badly in water" , "Land amid water" .)

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

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