Related Clues:

• Day saver
• One may be needed after an injury
• Type of sandwich
• Lifeguard, at times
• White-hat wearer
• Not a starter
• Villain's vanquisher
• White knight, stereotypically
• Johnny-on-the-spot, perhaps
• Han or Luke, e.g.
• Sonar user
• Subway purchase, perhaps
• Warship
• Stand-in, for short
• Sandwich shop order