Based on the clue '7 letter word meaning extinct or no longer in use', what is the answer?

Based on the clue '7 letter word for a formula in mathematics deduced...', what is the answer? Based on the clue '7 letter word for a grove of fruit or nut trees', what is the answer? Based on the clue '7 letter word for one who turns away from whats ri...', what is the answer? Based on the clue '7 letter word for the highest layer of dirt from w...', what is the answer? Based on the clue '7 letter word meaning to wear or eat away by the a...', what is the answer? Based on the clue '7 letters german for german', what is the answer? Based on the clue '7 letters okra stew plus dutch south african', what is the answer? Based on the clue '7 letters phil collins mike rutherford tony banks', what is the answer?