GFR Cryptic Xmas Challenge

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Across
  1. 3. A classification favourite fix (9)
  2. 6. Briefs occupying 2nd floor (acronym)
  3. 8. Type of commands made in GFR and TOA (11,6)
  4. 9. Parliamentary committee responsible for how things are done
  5. 10. Errors or omissions in your past (acronym) (3)
  6. 11. occasionally checking over the shopping list (8,6)
  7. 13. top student of the Treasury (3,7)
  8. 14. Scarface would say not to get high on your own (6)
  9. 15. Comptroller and Auditor General (5,5)
Down
  1. 1. - Biggest issue right now
  2. 2. Commons occurance on 21 December (5,5)
  3. 4. name of the latest rock (5,4)
  4. 5. It tots up the entirity (5,2,10,8)
  5. 7. an award winning utility or prize lemon? (5)
  6. 10. Professional sight leads to an uncertain outcome (9)
  7. 12. A very happy boulder (9)