Seven clues in alphabetical order all beginning with “A” linked by a final clue which doesn't.
1. The best hold a degree – you can count on them(5)
2. Initially it connects MASH and radar(7)
3. Six to nine links rara avis?(9)
4. From amazon to zambesi, the sacred river needs help(8)
5. I can't dance – it's grotesque!(5)
6. Take the edge off square or link up?(7)
7. Gathered like wee blue fish(7)
The last of the above, perhaps they make you sick(7)