Dance madly in Tonga (5)
I believe the answer is:
tango
'dance' is the definition.
(tango is a type of dance)
'madly in tonga' is the wordplay.
'tonga' anagrams to 'TANGO'.
Though, I am unsure how the anagram 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" .)