'Ant' and 'Ent' words

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Across
  1. 4. Happens a lot. Synonym for often
  2. 7. Somebody who helps in a particular task
  3. 8. Well meaning and kindly
  4. 10. Synonym for old
Down
  1. 1. Somebody who studies at school, college or university
  2. 2. Bold, energetic and forthcoming
  3. 3. Unsure and slow
  4. 5. Somebody who watches something closely is said to be this
  5. 6. A falling out or a debate
  6. 9. An acceptable standard