The most common and most likely answer to this crossword clue is the 8 letter word SAMBAING
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More clues leading to the result SAMBAING
Buddy explains!

The straight part
We know that "Doing Brazilian dance" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case doing brazilian dance = sambaing.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SAMBAING mean?
SAMBAING verb- To dance the samba.