7.

12345678910111213
Across
  1. 4. Put a seal of approval on, overseas
  2. 6. Stone work which is above a learner (4)
  3. 7. Sell on overseas markets (6)
  4. 9. Fraud is above a leader's wife (11)
  5. 10. Letter from Greece going abroad, mailed miles afield initially (5)
  6. 13. Awful local place close to old money around central Germany is above attack (4-4)
Down
  1. 1. I go to church with a loud student on overseas excursion and discover a cold water covering (7)
  2. 2. Impatient agent abroad's always interrupting
  3. 3. Penniless in the extreme -- money from abroad's in the mail (7)
  4. 5. ABC show centred on overseas news (------- Correspondent) (7)
  5. 8. Appearances of rock groups put on abroad (8)
  6. 11. Word on overseas mail
  7. 12. Letter from abroad's unknown arrival time (4)