The most common and most likely answer to this crossword clue is the 8 letter word CARIOCAS
I've seen this crossword clue in The Daily Telegraph
C
A
R
I
O
C
A
S
Buddy explains!
The straight part
We know that "Brazilians" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case brazilians = cariocas.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 CARIOCAS mean?
CARIOCAS noun- An inhabitant of Rio de Janeiro.
- A sideways step in which one leg crosses over the other.