Cryptic crossword clue
Knave, loud sort, agitated very cool character 4,5

The most common and most likely answer to this crossword clue is the 4 plus 5 letter word JACK FROST

I've seen this crossword clue in The Daily Telegraph
J
A
C
K
F
R
O
S
T

Buddy explains!

The straight part
We know that "very cool character" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case very cool character = jack frost.
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.

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