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Back-to-back, various graduates dance (5)

Ross

I believe the answer is:

samba

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'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" .)

I've seen this clue in The Sun, The Telegraph and The Times.
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