The most common and most likely answer to this crossword clue is the 4 letter word RAZZ
R
A
Z
Z
Buddy explains!
The straight part
We know that "One blown rudely" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one blown rudely = razz.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 RAZZ mean?
RAZZ noun- A version of seven card stud where the worst poker hand wins (called lowball).
- To tease playfully; to heckle.
- To drive an automobile around.