Argentinian dance (5)
I believe the answer is:
tango
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">argentinian dance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tango that I've seen before include "Dance; letter T" , "T in radio alphabet" , "Dance; T (radio comms.)" , "Modern ballroom dance" , "Dance music" .)