Well, lots of questions.
9A - Martin Haug recorded at the beginning (10) - who Martin Haug ? I have ??A?M?N?S?.
8D - Stevenson's may be thought to know how to make the coast irresistibly attractive (3,7) I haveS?E???????
11D - My age-old aunt badly upset - she died of grief (4,8) I have ???????T???E
I can't see the wordplay or significance of the 'recorded at the beginning ' so can't decide between Brahmanist or Brahmanism. The 'at the beginning' might be first =ist but that may be nonsense,
Ignore those ramblings.
I see his book was called Origins of Brahmanism so 'origins' explains 'the beginning', presumably recorded = wrote, and so BRAHMANISM does look right