Goldsmith Cryptic

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Across
  1. 1. Haber's pride and humble. condiment
  2. 4. Oppenheimer's cousin has 9 lives
  3. 6. Name of mediocre ruler cursed with blessings
  4. 8. Casual romance ending in entente
  5. 11. Think man! say worthless coins
  6. 12. Plastic scholar with arithmetic skill
Down
  1. 2. Final demand of a partner
  2. 3. Favourable market pays out its weight
  3. 5. Spanish meson got old, say
  4. 7. Sloth makes dregs of men
  5. 9. Cryptic language of an emperor
  6. 10. Of both- minds about combining capacity