Related Clues:

• It can follow the last word of 20-, 27-, 43- and 53-Across
• Surfboard skeg, e.g.
• Pen end
• Old Cadillac feature
• "You may have a ___"
• Scoring unit
• The last word in many a foreign film
• Shark feature
• Sign of a lurking shark
• Bass part
• Scoreboard unit
• See 10 Across
• Use one's index finger, perhaps
• $5 bill
• ’50s car feature