1: Man, what an avant-garde US artist! (3)
2: Perhaps a bathroom contractor is mentioned to a former president (5)
3: Kind of a nut, I hit a cop's convertible (9)
4: Polygraph unexpectedly traps vandal (3)
5: After party longing for senior member (5)
8: This is always resplendent, adorning heads (5)
9: ... but go oil crazy in snow house (5)
11: You audibly ram partner (3)
13: Sheep to start wallowing in ease (3)