The most common and most likely answer to this crossword clue is the 6 letter word BIGAMY
I've seen this crossword clue in The Sunday Telegraph
B
I
G
A
M
Y
More clues leading to the result BIGAMY
- Crime, through having bagged Yuletide threesome up
- Crime of ambitious Johnson?
- Several engagements may result in this large armed force eliminating resistance
- Grown-up girl’s crime
- Great girl, marrying unlawfully
- Having spare rib on two occasions like venison?
- Girl seen after serious crime
- Magnanimous woman having two husbands?
- Major forces Right to go in union with extra trouble and strife?
- In which second mate causes offence?
Buddy explains!

The straight part
We know that "crime" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case crime = bigamy.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 BIGAMY mean?
BIGAMY noun- The state of having two (legal or illegal) spouses simultaneously.
- A second marriage after the death of a spouse.