The most common and most likely answer to this crossword clue is the 9 letter word BREVETTED
B
R
E
V
E
T
T
E
D
Buddy explains!
The straight part
We know that "having a special rank" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case having a special rank = brevetted.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 BREVETTED mean?
BREVETTED verb- To promote by brevet.