Where King Tupou VI reigns (5)

I believe the answer is:

tonga

(Other definitions for tonga that I've seen before include "Polynesian monarchy, member of the Commonwealth" , "Pacific Ocean kingdom" , "South Pacific kingdom, capital Nuku'alofa" , "Two-wheeled Indian vehicle" , "S.W Pacific Kingdom" .)

I've seen this clue in the Newsday.

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