The most common and most likely answer to this crossword clue is the 9 letter word JUMPED-UP
I've seen this crossword clue in Financial Times
J
U
M
P
E
D
-
U
P
Buddy explains!
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 JUMPED-UP mean?
JUMPED-UP adjective- Thinking or acting as if one is superior, as by pretending to be of a higher class or having greater authority than is the case.
- Having risen from a lowly station or an inferior position, often with implication of conceit or arrogance.