10a. A sign that the commanding officer's in prison perhaps (8) ?C??????
12a. Frank article written by G B Shaw (7) C??????
6d. One gets four or six in the test, but it's unimportant (7) T?????L - is it TRIVIAL?
7d. Permission to give the fellow an appointment (7) M?????E
8d. Smoothed out on board, perhaps? (6) ?????D