Island I find a little bizarre (5)

I believe the answer is:

ibiza

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'island' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for ibiza that I've seen before include "part of the Balearics" , "Holiday island" , "A Balearic 5 across" , "Balearic holiday isle" , "holiday resort" .)

I've seen this clue in The Irish Independent.

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