The answer to the following riddle is a 12-letter word.
- My 1, 12, 8, 6, 9, 10, 4, 5 is a traveller in space.
- My 9, 10, 12, 6, 3, 11, 5 was the last word of Charles.
- My 5, 4, 12, 8, 11, 9, 3 is something that you should not do.
- My 2, 4, 7, 8, 11, 9, 6 is a combination of things.
- My whole can be double-dealing or even-handed.
What am I?