Related Clues:

• Scoop mud from, say, harbour
• Scoop up mud and silt from harbour bottom
• Clean out the bed of a river or harbour
• Remove material from a channel or riverbed
• Remove material from a riverbed
• Clean mud as from silted harbour
• Remove mud from a riverbed
• Is this what the doctor might fish up at the Border?
• Perhaps Stel slackens like this
• This may have the doctor on edge, but he'll get to the bottom of it
• Will the doctor get over the side and get to the bottom of this?
• Is the doctor on the side of this to get to the bottom of it?
• Get the doctor to the side up from the bottom
• Get it up from the bottom of the side at last
• The doctor is on the border of getting to the bottom of it