Latin-American dance (5)
'latin-american dance' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tango that I've seen before include "musical piece" , "Movement from Argentina" , "reputedly takes two" , "Latin-American dance - code for T" , "Latin American dance (requiring two?)" .)
(Other definitions for salsa that I've seen before include "Tomato relish" , "Latin-American dance" , "that's rather spicy!" , "The Latin-American sound" , "dancing?" .)