This one has a film-related theme (mostly). With thanks to Jude.

Across
1. Old film classification: aged five and over (1)
2. Old film classification: over 18 (1)
5. Out of fashion (5)
9. Show (7)

Down
3. Thank you (2)
4. You and me (2)
6. Slide over snow (3)
7. Thin film director (4)
8. Director of Anatomy of a murder (4)
10. Good movie (3)
11. Small part (3)