Possible Clues:

• Christmas morning? Quietly scarper
• By the end of the month, currently it will go
• Leave a politician gets at end of year
• Make off in the current way after one month
• Do a runner
• English, cold and wet outside, take flight
• At the beginning of December a Member may push off
• Go away suddenly - from tent?
• Escape
• Currently go by the end of last month