The most common and most likely answer to this crossword clue is the 5 letter word ARYAN
I've seen this crossword clue in Independent
A
R
Y
A
N
More clues leading to the result ARYAN
Buddy explains!
The straight part
We know that "one of the superior ones, it used to be said" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one of the superior ones, it used to be said = aryan.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.