Based on the clue 'a difficult prolonged struggle ...', what is the answer?

Based on the clue 'a dictionary defines it as the instants duration o...', what is the answer? Based on the clue 'a dictionary lists these for some words like humor...', what is the answer? Based on the clue 'a diet of algae shrimp crustaceans gives these wa...', what is the answer? Based on the clue 'a different band of brothers took to the air when ...', what is the answer? Based on the clue 'a difficult task is described as a long one of the...', what is the answer? Based on the clue 'a digital phrase meaning to hitchhike', what is the answer? Based on the clue 'a dijon flavored puddinglike dessert', what is the answer? What is referred to by 'a dilapidated old building'?