Dance a doctor introduced to South America (5)
I believe the answer is:
samba
'dance' is the definition.
(Brazilian dance)
'a doctor introduced to south america' is the wordplay.
'doctor' becomes 'mb' (Bachelor of Medicine, Medicinae Baccalaureus).
'introduced to' means one lot of letters goes inside another.
'south america' becomes 'SA' (abbreviation).
'a'+'mb'='amb'
'amb' put inside 'sa' is 'SAMBA'.
(Other definitions for samba that I've seen before include "South American dance" , "Lively ballroom dance from Brazil" , "it was launched in Brazil" , "Dance, originally from Brazil" , "This ambassador's > brisk steps" .)