The 2nd St Cat's Slightly Cryptic Crossword

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Across
  1. 2. muddied stain leads to holy person (5)
  2. 4. Good enough company thrown together upstairs (4)
  3. 8. Andy loses the point and gets muddled for 24 hours (3)
  4. 9. Learn by heart and note well, literary sister (6)
  5. 11. I moved retail round middle c to make room for music
  6. 14. Ross & Monica lose their head but gain a grand house (6)
  7. 15. Make hardest place to paint (3,4)
  8. 18. Plays sport with Nashville aryans (11, 5)
  9. 19. Archie sent scrambles kates (10)
Down
  1. 1. A tenth off the full half dozen for sixth (4,5,4)
  2. 3. Sounds like pumpkin was held in games room (6,5)
  3. 5. Sixth form turn into Caen entry (9)
  4. 6. In Gosport shall we play games (6,4)
  5. 7. Muddied welly worn by one in charge of staff (6)
  6. 10. Lady of the house takes first of best in honour (7)
  7. 12. jampot haystack is the Duke of Edinburgh's superwoman
  8. 13. Macedonian king reigns in 1D (9)
  9. 16. Listen by monster lock for fourth mother (8)
  10. 17. I knead mixture for aunty Jacki (6)
  11. 20. Messy mad house (5)