The crossword solution for the term 'DOCTOR's Bane' is APPLE, which has five letters. An APPLE is a type of fruit that is often associated with health and nutrition, but it can also be a source of frustration for doctors. Apples are known to be a major source of allergies, and can cause a variety of medical issues for those who suffer from them. Additionally, apples can be difficult to diagnose and treat, making them a bane for doctors.