Musical set in Buenos Aires (5)
I believe the answer is:
evita
'musical set in buenos aires' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for evita that I've seen before include "Famous musical" , "Peron musical" , "Andrew Lloyd Webber musical set in Argentina" , "Nineteen Dn musical" , "Juan Peron's wife" .)