Cryptic crossword No 3,733

Across

1. Go potty like the Greeks 200 years ago? (4,4,7)
2. Pull the front off steam locomotive (6)
3. Run away - heart not in fight between Europeans (6)
4. Drunkard is in France to get as rich as possible (7)
5. Soaked up a bit of pus instead of blood initially as planned (7)
6. Sign the first letter (7)
7. Revolutionary twins start to negotiate with Russian (7)
8. It's gripping, the speed at which schoolchildren travel in a train? (9,4)
9. Stop to give away article on German tourists' weapon of choice (5,2,3,5)
10. My drunkenly arming former Squadron Leader with bloomers (4,9)

Down

1. Brewed seadog's ration (6)
2. Output from rechargeable battery? (9,6)
3. Reject programme chosen by Jamaican? (7)
4. Maybe French seating cover raised novel but unpalatable choices (5,2,1,7)
5. A group of characters smashing a table outside pub (8)
6. Material taken from paunchy licensee (5)
7. Old English politician's extremely tenacious finding spares (7)
8. Curtail copper's date in Whitby, perhaps (3,4)
9. Pockets in clothing (8)
10. Size of firm burgled by stealth occasionally (7)
11. Working phone available if needed (2,4)
12. When leaving university, attack bloke surviving off tarts (5)