Related Clues:

• Dull fellow
• It can be hard to swallow
• Re-re-re-remind
• Keep bugging
• Person who's hard to take
• Run-down equine
• Barrel's inside diameter
• Gun barrel diameter
• See 6 Down
• Remind repeatedly
• Act shrewish
• Capsule alternative
• Aspirin form
• Grousing spouse
• Back-seat driver, e.g.