Related Clues:

• Airplane wing supporter
• Mast, yard, boom, or gaff
• Fight, but not all-out
• Pole used in rigging
• Orient Express, e.g.
• Practice on canvas
• One coming down the aisle?
• Prepare for a performance
• Practice one's punches
• Box for fun
• Box gently
• Practice for the main event
• Commuter's transportation
• Train in a ring
• Erstwhile campaign vehicle