1. Her pills didn't ".................." better, so she's still ill (8)
2. If you go ................... then you come to B (5)
3. Panda in Zanzibar Zoo accident (5)
4. Like a herring but smaller, thicker and rounder (8)
5. With reference to it, it becomes to disclose (4)
Thank you, Calibax, that's the answer! I've managed to work out the others myself apart from No. 4 which I'm still working on. I'm wondering if it could be mackerel but the clue could be more cryptic than that.