Unchanged part of Christmas Island (2,2)

I believe the answer is:

as is

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

'part of christmas island' is the wordplay.
'part of' says the answer is hidden in the clue.
'AS IS' is hidden within 'christmas island'.

(Other definitions for as is that I've seen before include "With no changes" , "unaltered" , "In present condition" , "unchanged" , "In existing state" .)

I've seen this clue in The Telegraph.

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