Crossword Genius

Kingdom's natural leader, dressed in Roman costume (5)


I believe the answer is:


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'kingdom's' is the definition.
(kingdom in Polynesia)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for tonga that I've seen before include "Do a bad tango in the Pacific archipelago" , "South Pacific island group country" , "part of Polynesia" , "SW Pacific monarchy" , "Relatively small" .)

I've seen this clue in the Sydney Morning Herald.
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