The crossword solution for the term 'Canal Trouble' is 'EARACHE', which is a seven-letter word. EARACHE is a common medical condition that is characterized by pain in the ear, usually caused by an infection or inflammation. It can also be caused by a buildup of wax, a foreign object in the ear, or a perforated eardrum. Treatment for EARACHE typically involves antibiotics or other medications to reduce the inflammation and pain.