Across

1: Bird, crow, after degree (5)

4: Swedes put ball bearings in air defence system (4)

6: Exposed inside snake diahorrea (5)

7: Bring in vase by the mouth (4)

9: Back around Laos as well (4)

11: Cheery newspaper left New York (5)

12: Rather extreme crash after beginners start umpiring (4)

13: Scholar's editor is somewhat concerned (5)

Down

1: Broken dynamos - they start every week (7)

2: Coats baked goods (5)

3: Splash banknotes with eel's head (4)

5: Sourceless tannoy begins evangelising - Dad's frustrated (7)

8: Haunters remove her relatives (5)

10: Agency regularly goes ahead (4)