Related Clues:

• Cause of an icicle
• Unexpected info source
• Intermittent trickle
• IV
• Air problem
• Not hold water, say
• Puddle producer
• Radiator problem
• Grind gauge
• Be less than watertight
• Tell anonymously
• Scuba diver's worry
• Fall in drops
• Insomniac irritant
• Faucet annoyance