All the answers are famous people (one namers, living and dead).
1. Exclamation of a sky jumper, perhaps? (8).
2. Was he wacky? (5).
3. Argument with Annie, say? (7).
4. It's all relative. (8).
5. Miss Harry? (6). I have thought of Blondie but that is 7 letters.
6. "Ocean Child"? - Oh, no!!! (4)