The most common and most likely answer to this crossword clue is the 8 letter word SNOBBISH
I've seen this crossword clue in The Times
S
N
O
B
B
I
S
H
More clues leading to the result SNOBBISH
Buddy explains!

The straight part
We know that "Superior" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case superior = snobbish.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 SNOBBISH mean?
SNOBBISH adjective- Having the property of being a snob; arrogant and pretentious; smugly superior or dismissive of perceived inferiors.