Related Clues:

• One's successor
• Couple
• Seesaw necessity
• What turns 19 into 21?
• Ace plus one
• See 6-Down
• Afternoon hour
• Pair
• Bottom of a suit
• Figure
• Company, proverbially
• Difference between 19 and 21
• See 32-Down
• It may be wild
• Blackjack card