Thanks for the hints Chrise. I got answers to 3d and 9a from that, but couldn't parse either of them, until further explanations followed for 9a (glad I wasn't the only one bewildered by the second definition!)
However, I still can't parse 3d. If the answer is mythical birds (fabulous fliers), as Chrise said, then I assume it's a homophone of the word 'dazes' but I just can't see it.
And I am still at a loss regarding 24a, and still have no answer. Can't see what it has to do with 'alps' at all!