Related Clues:

• Surprise at the door
• Brief visit along the way
• Rest, as at an inn
• Make a casual call
• Pay a casual visit - by parachute
• Pay casual call or visit
• Pay a casual visit unannounced
• Come by, call on
• However skilled he may be, a doctor will have nothing with it
• Come and visit while the doctor has an operation in here
• Swing by for a visit
• Unexpected visitor ... and a hint to 20-, 33-, 40- and 52-Across
• Briefly visit
• Arrive unexpectedly
• Informally visit doctor at home about a small operation