9a) Poles obstruct characteristic route (7) T?????T
16d) Don't hang about as much, like astronauts (10) no letters
16a) Do up second-class level on board, say? (6) ?????K
25a) Send SA beasts back without one minor person (5-5)
28a) One continent or another if female ousts writer (7) A?????A
All help greatly appreciated.