What is referred to by 'a plessor'?

Based on the clue 'a pleasurable trip in an automobile especially whe...', what is the answer? Based on the clue 'a pleasure carriage with a raised drivers seat or ...', what is the answer? Based on the clue 'a plectrum of a harpsichord or a porcupine part', what is the answer? Based on the clue 'a plentiful or overflowing quantity or supply', what is the answer? Based on the clue 'a plethora of hiking riding trails are in this vi...', what is the answer? Based on the clue 'a plot twist in an oscar wilde play hinges on her ...', what is the answer? Based on the clue 'a plotted revolt to overthrow a government execute...', what is the answer? What is associated with: a plow is depicted on the seal of this cabinet department created in 1862?