Back-to-back, various graduates dance (5)
I believe the answer is:
samba
'dance' is the definition.
(sambaing is a kind of dancing)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for samba that I've seen before include "Dance music" , "Lively ballroom dance from Brazil" , "South American dance" , "it was launched in Brazil" , "Latin dance" .)