Key, perhaps, to the primitive mind's acceptance of endless jargon (6)

I believe the answer is:

island

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'key perhaps' is the definition.
(I know that cay is a type of coral island)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for island that I've seen before include "Man, maybe" , "Eg, Borneo" , "Body of land entirely surrounded by water" , "6 Across, for example" , "Possibly key" .)

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

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