### Clue: Crime, through having bagged Yuletide threesome up (6)
### Answer: BIGAMY 
 ### Explanation: Definition: Crime
 BY(through/using a specific means or agent, as in "he achieved fame through sheer luck") **containing**(having bagged) **reversal of**(… up, in a down clue) MAGI(the Yuletide threesome/the 3 Biblical Magi/Wise Men who came to visit Jesu at Christmas).
Having married 3 women from the Xmas party?