Cathy vs Mommy

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Across
  1. 2. sage and onion (8)
  2. 4. Apple and stairs, multiple typo (4+1)
  3. 5. BBC, Fox, 6 o'clock, Evening, Good, Bad (4)
  4. 9. Russian Matriarch (9)
  5. 10. pleasant shady place in forest (5)
  6. 11. An inflatable rubber bag (7)
  7. 12. Ring-shaped pasta whose name means "little cakes" (10)
  8. 14. How blank you? (3)
  9. 18. before Durban's state synonym(8)
  10. 19. 'Anyone there?' (5)
  11. 21. Extra characters such as spaces used to reach a length (7)
Down
  1. 1. A piece of flying equipment, naturally (7)
  2. 3. Macedonian Emperor's suffix (5).
  3. 6. Mediocre songs used to pad out an album (6)
  4. 7. Expel (6)
  5. 8. Bed not up to material (6)
  6. 13. Constantinople's modern state (6)
  7. 15. Elizabeth is to Margret of Snowdon (6)
  8. 16. Source of Popeye's strength (7)
  9. 17. A head rest (6)
  10. 20. Whistle a what (3)