Possible Clues:

• Not to make it dry, a doctor's X
• The doctor is too young to take a little water with it
• Make damp, say lips with tongue
• Add a little water and one doctor is ten
• With the help of a little water, the Medical man has reached double figures
• Wet - second one's turned up collar
• Wet, but just a little
• So I'm changing the number to put a damper on things
• Now that little Moses has got to ten, just add a little water
• The doctor is very young - and so wet!