Unaware wiping out large island is easy to detect (7)

I believe the answer is:

obvious

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'unaware' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?

I can't explain the remainder of the clue.

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(Other definitions for obvious that I've seen before include "Quite clear and manifest" , "Easily perceived or understood" , "Clear; easy to see" , "Not subtle" , "Glaring" .)

I've seen this clue in The Independent.

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