What is referred to by 'a sucrologist'?

Based on the clue 'a successful string theory would describe natures ...', what is the answer? Based on the clue 'a succession of monarchs from the same family', what is the answer? Based on the clue 'a succinct formulation of a principle or truth', what is the answer? Based on the clue 'a succulent can be any plant with fleshy thick tis...', what is the answer? Based on the clue 'a sudden attack perhaps on bugs by a certain insec...', what is the answer? Based on the clue 'a sudden burst of light some can be in the pan', what is the answer? Based on the clue 'a sudden capricious desire or act', what is the answer? Based on the clue 'a sudden change of windspeed or direction it also ...', what is the answer?