Cryptic across

5 Concerning, relationship of a bishop – foolish, if platonic (10)
7 Gothic writer’s suppressing pressure to become a Catholic leader (4)
8 Picasso or Dali, for instance, are not commonly seen in a Sierra (8)
9 Buddhism for some followers finding it hard to get to the highest point (6)
10 Stable place to eat in France (6)
11 Boys terrified to grasp the opportunity offered by this world? (6)
14 Pretentiousness getting degree backed by part of Oxbridge (6)
16 Church support for Orkney site (8)
17 Here the Greeks primarily tested resolve over years (4)
18 Is dim Canon busted to the ranks in order? (10)