What's the big idea?

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Across
  1. 3. Beagle vet (anagram)(9)
  2. 5. Pungent root (5)
  3. 8. A varied mix (6)
  4. 10. Cutting on an equal level (7)
  5. 11. Producer of many of the James Bond films (8)
  6. 13. Young & callous? (4,4)
Down
  1. 1. Asparagus pens (anag) (5,4,4)
  2. 2. Call a plumber! (4)
  3. 4. Gaelic eyebrows (7)
  4. 6. Swine in a red dress (6)
  5. 7. Basidiomycota(8)
  6. 9. Tulips to round up sheep? (11)
  7. 12. vReason my Ford failed its MOT (6)