The most common and most likely answer to this crossword clue is the 7 letter word IMMORAL
I've seen this crossword clue in Independent
I
M
M
O
R
A
L
More clues leading to the result IMMORAL
- Bad mark repeatedly given in current exam
- One million marks on exam — cheating?
- One, then two marks added to spoken exam — that’s unethical!
- Bad months after one’s exam
- Hoskins is male and said to be wicked
- Sinful convert ultimately abandons old god
- Wrong marks doubled in current exam
- Cyclops is having medium sort of sex – wicked!
- Timeless, timeless, sick
- Current examination involving married male is unethical
Buddy explains!

The straight part
We know that "wicked" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wicked = immoral.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 IMMORAL mean?
IMMORAL adjective- Not moral; inconsistent with rectitude, purity, or good morals; contrary to conscience or the divine law.