Crossword Genius

Islander whose work was done by Friday (8,6)

Ross

I believe the answer is:

robinson crusoe

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'friday' is the definition.
Both the answer and definition are singular nouns.
Maybe there's a link between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for robinson crusoe that I've seen before include "As hero of book" , "Novel castaway" , "classic book" , "Fictional castaway" , "Defoe's castaway" .)

I've seen this clue in The Independent.
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