1: Fish spawn upstream in little orifices (3)
2: Author of Breathe Out, Lay Out, Going Out? (4,5)
3: Some slippers and also shoes (7)
4: Lug worm finally being a symbol (5)
6: Comes to as Ken from Perth gets in (7)
8: 500 = 100 + 0 - that's entertainment! (5)
11: Sprinted fleetly? (3)