Antipodean website for swapping of couples (4)

I believe the answer is:

kiwi

'antipodean' is the definition.
(someone from New Zealand, one of the antipodes)

I don't understand the remainder of the clue.

(Other definitions for kiwi that I've seen before include "Fruit and flightless bird" , "Sacred Japanese peak" , "Flightless New Zealand bird" , "New Zealander (informal)" , "Hairy fruit with green flesh" .)

I've seen this clue in The Times.

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