Dance originating in Tonga? (5)

I believe the answer is:

tango

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'dance' is the definition.
(tango is a type of dance)

'originating in tonga?' is the wordplay.
'tonga' anagrams to 'TANGO'.
However, I am not clear how this is indicated.

Can you help me to learn more?

(Other definitions for tango that I've seen before include "Activity requiring two to" , "Dramatic ballroom dance from Argentina" , "T in radio alphabet" , "South American dance (for two?)" , "Colourful dance from Argentina" .)

I've seen this clue in the Evening Standard.

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