Dance madly in Tonga (5)

I believe the answer is:

tango

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

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

'madly in tonga' is the wordplay.
'tonga' can be anagrammed to 'TANGO'.
However, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for tango that I've seen before include "Latin American dance takes two to do it" , "Dramatic dance form Argentina" , "Argentine dance" , "Last - in Paris (film)" , "Dance originating in Argentina" .)

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