1: Mug returns to 100 degrees, causing an ulcer. (7)
3: Shipper holds stylus for woodworker (9)
4: He's not joking, it's completely lawless. (2, 3)
7: Paul wears shirt the wrong way to provide shoulder covering (7)
9: Fancies and gets hard around (5)
12: Consumed, beginning at the end (3)