1- Arrival with a message from the emperor (6) W????? 2- The Hydra was a bird (in start of leading article) (7) L?R???N 3- Tree creature in retreat (6) ???R?? 4- Auditor left altered entrie (8) ??S?E?E? 5- Ungodly siren broadcast in booming manner (12) ????U???N?LY 6- Commonwealth capital has something beneficial on both sides of the street (6) ??S?O? 7- Increase in importance for cocktail (8) S??????L? 8- Puzzle of polar explorer finding wife in short trousers (9) C?O?????? 9- Unpleasant behaviour, as can get head coming round (9) ????????S