The most common and most likely answer to this crossword clue is the 7 plus 5 letter word STUFFED SHIRT
I've seen this crossword clue in The Daily Telegraph
S
T
U
F
F
E
D
S
H
I
R
T
More clues leading to the result STUFFED SHIRT
- A pompous ass
- Feeling full, runs into this silly pompous ass
- Stick-in-the-mud part of scarecrow?
- Pompous ass with money dithers dreadfully
- This red design on material is old fashioned
- Pompous person, with material beginning to expose scandal, keeping quiet
- Fossil squeezed on top
- Bore crowd with this red composition
- A bore, possible reason for apparent expansion of corporation?
Buddy explains!
The straight part
We know that "pompous ass" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pompous ass = stuffed shirt.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.