ella bored kempson bored cryptic <3

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Across
  1. 4. Wonder over skinny potassium.
  2. 5. Excavate Roman house.
  3. 6. Talking tree startles Josh, a kid.
  4. 8. Source says he outran champion at farm.
  5. 12. Decorates street lacking best gems.
Down
  1. 1. Mighty mother begins mulling over their heirs.
  2. 2. Link is nil-to-one strong.
  3. 3. Propose position of Young singer?!
  4. 7. Messy sap starts win for insect.
  5. 9. A hundred legs ascends.
  6. 10. Destroy various vermin of humble beginnings.
  7. 11. Gone with a mixed up newt.