1: A garden ornament makes men go mad (5)
4: How to get around doing business, essentially (3)
6: Escalating naked conflict (3)
8: Smuggler participating in arms race? (9)
10: Observed no Knight (5)
11: Its a firm, small lettuce (3)
12: Right, turn right to play with robot (3)
13: Part of stair is erect (5)