MM, Scoter isn't right for 19 - but the answer does begin with S. The definition is 'air', as in a song. You need a four-letter waterfowl, very common, then the usual 'banks' of 'Exe'.
8. The answer is 'language experts', experts in a specific language. 'Twice apprehended by American' gives you 2 x one letter. The 'deserters' are the usual short crossword word.
PS The main course wasn't what I'd have come up with. Do you like sausage rolls? It's a posh version!