The answers to the clues below will have something in common. Can you determine what it is?

1. Proverbial advice to a physician
2. Cry like a baby
3. Certain no-parking area
4. Motown genre

Answers:

1. "Heal thyself"
2. Bawl 
3. Tow-away zone
4. Soul music

What the answers have in common:

Phonetically, the first word of each answer is a foot part:

1. Heel
2. Ball
3. Toe
4. Sole 

Credit:
Jennifer Nutt