Cryptic crossword No 2,820

Across

1. Severe disruption when a near miss surrounds cow, strangely, and knight (5,4)
2. European country is wicked, with assistant within (5)
3. Tech billionaire endlessly caters (half, anyway) a type of grape (6)
4. Rock star is following short marsupial and bedding down for the night (8)
5. Arrival delayed to a place to sleep with a strange tale within (7)
6. FBI centrally alter CIA about micro-organisms (9)
7. Former Eastenders actor, half a joke, tailed by military police (4)
8. Dispatched representative confuses: miser, say (8)
9. Two saints surrounding pee, oddly enough, east is most precipitous. (8)
10. Within Bach exists a dull pain (4)
11. Your tits, surprisingly, are visited by many! (8)
12. Church tax exists inside anti-theist (5)
13. Urge Tom: mash up top quality nosh (7)
14. Rugged and uneven supercomputer has horse inside (6)

Down

1. Inside Mister Rat all mistakes listed (6)
2. Corporate showcase event certainly provides publicity (8)
3. A fool! A fool! Is not initially a killer (8)
4. Anglo-Welsh river, close around annual celebration (3,4)
5. Poetically, dusk and the National Trust create a happening (5)
6. Burn wood, sorrow for that (but not at first) is a virtue (7)
7. Confusingly I am surrounding king or lady (4)
8. 2 dn e.g., or lay about (5)
9. Musical instrument in jolly recital (4)
10. Sudden movement last night: the magical woman (6)
11. Headless Pope has portion of food, resulting in surgical procedure (9)
12. Family, bizarrely regal, a regal play (4,4)
13. Desperate longing sounds like it's here, troublesome cheat (9)
14. The first five letters bar the second surround a fizzy drink. High praise indeed (8)