Related Clues:

• Return
• Ramp sign
• Be philanthropic
• Stopped working, as an engine
• Tip one's king, e.g.
• Highway sign
• Mammoth attraction?
• Give up, slangily
• Spelunking site
• Spelunker's site
• ... and its home
• Shell out
• Cease
• Investment return
• Home of 37-Down