Related Clues:

• With 15-Down, hangs on the line
• Cause of an icicle
• Intermittent trickle
• IV
• Grind gauge
• Fall in drops
• Insomniac irritant
• Faucet annoyance
• Water fall?
• Sound of a defective faucet
• Slo-o-ow leak
• Stereotypical insomnia cause
• Water waster
• Case for a plumber
• Total bore