1: Partially affect a steak's flavor (5)
2: Fish spawn upstream in little orifices (3)
3: Maid Marian - half American (9)
4: Something useful - like a matching collection? (5)
5: Looks like an eyesore, sounds like an eyesore (3)
9: Record left by teacher in Siam (5)
10: 500 = 100 + 0 - that's entertainment! (5)
11: The end, you say? On the contrary! (3)
13: Taverns quoted cool clique (3)