9)A spoonful of sugar helps (7).............I think this must be a reference to medicine of some sort, but I can't quite get something with 7 letters.
24)Rosemarys fuel perhaps (6,6).............is it a type of petrel perhaps........ can't see the significance if its stormy.
26)Almost a breakfast cereal (9)
19)Just the usual angry William (6,9) ? crossbill
40)Enter this area by paying (9)