Related Clues:

• Career
• On the __
• On the __ (at large)
• ''Head for the hills!''
• Go rapidly
• Pick up the pace, old-style
• Homer's outcome
• Get shaking
• On the __ (fleeing)
• Get going fast
• Compete in a meet
• Get a move on!
• Rush off
• Hightail it, old-style
• Something 18-, 26-, 42- or 51-Across might have