1: Loathing for leader leaving platform (5)
3: You audibly ram partner (3)
5: Hazardous emanation from river used by a crime boss (5)
7: Cleaning aid possessed by Fragonard (3)
8: Partly indicates progress of undergraduate (2,1,6)
9: One politician's a brat (3)
10: Ordered hoop to conserve mass and energy (5)
12: Revolves around a star. (3)
13: Neil Armstrong initially brought back extraterrestrial (5)