The most common and most likely answer to this crossword clue is the 8 letter word UNLAWFUL
U
N
L
A
W
F
U
L
More clues leading to the result UNLAWFUL
- Illicit global union left a load of rubbish
- Not allowed except when half-dropping pants
- Tunnel oddly useless for criminal
- Intergovernmental organisation heads shocking, claiming Luxembourg to be criminal
- Every second in tunnel ghastly, not right
- Peacekeepers left in a terrible state? It’s not sanctioned
- A Parisian lad’s first to confront horrid criminal
Buddy explains!

The straight part
We know that "criminal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case criminal = unlawful.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 UNLAWFUL mean?
UNLAWFUL adjective- Prohibited; not permitted by law (either civil or criminal law; see illegal).