Related Clues:

• See 21-Down
• Couples' starting point
• Steel ingredient
• Decrease?
• Course requirement?
• Driving place
• Hemoglobin component
• Start of a long drive?
• Heavy metal
• Souvenir shop item, for short
• Palmer's peg
• Cross it (and dot your i's while you're at it)
• Fairway selection
• It's pumped
• Green peg