Killed by some wild islanders (5)

I believe the answer is:

slain

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'killed' is the definition.
(slaying is a kind of killing)

I cannot understand how the rest of the clue works.

(Other definitions for slain that I've seen before include "Slaughtered" , "Put to the sword" , "Violently killed" , "Killed, murdered" .)

I've seen this clue in the Evening Standard.

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