Possible Clues:

• Tap concern
• A washer might stop it
• Sign of a thaw
• What falls from an icicle
• Intravenous process
• Spot an ineffectual person
• Weakling is dead — needs epitaph
• Spigot issue
• Irish Water needs to sort this out with last letters from department for starters
• Writing in decline - or that's the leak?