The most common and most likely answer to this crossword clue is the 8 letter word UGLINESS
I've seen this crossword clue in Financial Times
U
G
L
I
N
E
S
S
More clues leading to the result UGLINESS
- Unpleasant quality of upper-class actor’s part in G&S
- English endlessly misused in America? A far from attractive trait
- Fruit on head – not a good look
- Hit single in America – wicked quality
- Extremely unnerving school punishment imposed on son, nasty character
- Cape fruit previously creating a nasty scene?
- Girl gets punishment in the States for threatening behaviour
- Good punishment for students in America showing repulsive attribute
- Single wrong accepted by general public as horror
- A most unfair condition
Buddy explains!

The straight part
We know that "nasty character" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nasty character = ugliness.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 UGLINESS mean?
UGLINESS noun- The condition of being ugly
- An unsightly or frightful object