Related Clues:

• Drill for dull person
• Make a hole with a pointed tool
• Drill or be tedious
• A tedious long-winded person
• A tedious talkative person
• Drill to be tiresome
• Drill or weary
• Diameter of a gun barrel
• Such a drill would be dull
• It sounds like an absolute swine when the drill is so dull
• Too dull to make the whole of this, by the sound of it
• If one is a bit dull, will one get the whole of it, by the sound of it? (4)
• However dull, endured this - that's the drill!
• 'Make the whole of it, by the sound of it, so dull (4)'
• Stood this, however dull