The most common and most likely answer to this crossword clue is the 6 plus 2 letter word JUMPED UP
I've seen this crossword clue in The Times
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More clues leading to the result JUMPED UP
Buddy explains!
The straight part
We know that "Started from chair/appearing arrogant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case started from chair/appearing arrogant = jumped up.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.