13a. Fish had gone off presumably.?M?L? Could it be smell ?
14a. Handy way round.? L?????S?
19a. Main constituent. .??N?
6d. Restaurant worker I leave rocks dessert. It's water something.???
15d. Factory with Trudy,not Re ,doing investigation into efficiency. I think it's something study ????
Many thanks to all in advance for help....I forget where to write my thanks,as question or answer ?? ,!