Possible Clues:

• Two males, one in bed to carry out
• Obligate
• Pledge from left-winger falling short over time
• Promise, pledge
• Put away, as it causes readers to pause - for the most part it's unfinished
• Perpetrate, as a crime
• Pledge to most of those opening 15 across
• Imprison select group of MPs without support, of course
• Dedicate
• Confine and execute