Crossword Genius

Country where native leader is seen in Roman costume (5)

Ross

I believe the answer is:

tonga

I'm a little stuck... Click here to teach me more about this clue!

'country' is the definition.
(I know that Tonga is a country)

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 "Polynesian island" , "Tropic island" , "Islands once ruled by Queen Salote" , "SW Pacific monarchy" , "South Pacific island group country" .)

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