Crossword Genius

One naturally separated from the rest of humanity (8)

Ross

I believe the answer is:

islander

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'rest of humanity' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'one naturally separated' is the wordplay.
'one' becomes 'i' (Roman numeral).
'naturally separated' becomes 'slander' (I am not sure about this - if you are sure you should believe this answer much more).
'i'+'slander'='ISLANDER'

'from the' acts as a link.

Can you help me to learn more?

(Other definitions for islander that I've seen before include "Inhabitant of Skye, say" , "Eg, a Manxman" , "One living surrounded by water" , "Sicilian, e.g." , "E.g. Shetland inhabitant" .)

I've seen this clue in The Globe and Mail and The Guardian.
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