I've really got stuck on this today. 2d) 5=51 + 10/1 (back in France) (5) L????
4d) Not sure article was written by early Christian philosopher (8) A?????I?
6d) Jam is contaminated by radioactive metal strip (6) M?B???
9a) Where sutdents are working in this together (6) ???S??
11a) Some nerve to have weapon attached! (4) ???N
12a) August sees trains swapping halves in front immediately (10) ??A???S?U?
Any help would really be appreciated