The most common and most likely answer to this crossword clue is the 6 letter word FELONS
I've seen this crossword clue in The Guardian
F
E
L
O
N
S
More clues leading to the result FELONS
Buddy explains!
The straight part
We know that "Criminals" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case criminals = felons.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 FELONS mean?
FELONS noun- A person who has committed a felony.
- A person who has been tried and convicted of a felony.
- A wicked person.
- A bacterial infection at the end of a finger or toe.