Crossword Genius

Greek intellect in one's secret island (6)

Ross

I believe the answer is:

noesis

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'greek intellect' is the definition.
The definition suggests a singular noun which matches the answer.

'one's secret island' is the wordplay.
'one's secret' becomes 'noes' (I can't justify this - if you can you should believe this answer much more).
'island' becomes 'is' (abbreviation).
'noes'+'is'='NOESIS'

'in' is the link.

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I've seen this clue in the Sydney Morning Herald.
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