Possible Clues:

• What is 8 across doing for individuals from 4 down dealing with Old Nick perhaps? (7,3'1,4)
• What was Faust doing with Mephistopheles - reportedly, it's what Molly Malone was achieving presumably? (7,3'1,4)
• Dealing with broken nose? In the spirit world, doing this would only appeal to old Nick! (7,3'1,4)
• Willing to do anything for success